made libmysqld/Makefile.am to have same licence as libmysqld/CMakeLists.txt

per-file comments:
  libmysqld/Makefile.am
Bug#54906      Inconsistent license of libmysqld
        Added GPL license header instead of Library GPL.

Problem:
- ORDER BY for utf8mb4_bin, utf16_bin and utf32_bin returned
  results in a wrong order, because old functions
  (supporting only BMP range) were used to handle these collations.
- Additionally, utf16_bin did not sort supplementary characters
  between U+D700 and U+E000, as WL#1213 specification specified.

 - Remove include of ha_ndbcluster_tables.h from mysqldump.c

      
The lock_type is upgrade to TL_WRITE from TL_WRITE_DELAYED for
INSERT DELAYED when inserting multi values in one statement.
It's safe. But it causes an unsafe warning in SBR.
      
Make INSERT DELAYED safe by logging it as INSERT without DELAYED.

            not tested by ABI check

plugin_audit.h and plugin_ftparser.h are now subject
for ABI check. plugin.h is now tested implicitly.

Also fixed broken ABI check cmake rules.

Handle combined instrument states of ENABLED and/or TIMED:

ENABLED TIMED
1 1 Aggregate stats, increment counter
1 0 Increment counter
0 1 Do nothing
0 0 Do nothing 

Problem: trailing spaces were stripped using 8-bit code,
so the truncation result length was incorrect, which led
to an assertion failure.
Fix: using multi-byte safe code.

Before this fix, the server did not recognize 'short' (as in -a)
options but only 'long' (as in --ansi) options
in the startup command line, due to earlier changes in 5.5
introduced for the performance schema.

The root cause is that handle_options() did not honor the
my_getopt_skip_unknown flag when parsing 'short' options.

The fix changes handle_options(), so that my_getopt_skip_unknown is
honored in all cases.

Note that there are limitations to this,
see the added doxygen documentation in handle_options().

The current usage of handle_options() by the server to
parse early performance schema options fits within the limitations.
This has been enforced by an assert for PARSE_EARLY options, for safety.

Before this fix, the ha_read_last_count status variable was defined and
updated internally, for never exposed as a system variable.

This fix exposes the system variable as "Handler_read_last",
for completness of the Handler_read_* system variables interface.

Adjusted tests results accordingly.

The 'mysqlhotcopy' tool gets into bin/ directory after the installation
from the scripts/.
So check for it in that in the mysql-test-run.pl.

per-file comments:
  mysql-test/mysql-test-run.pl
Check the bin/ for mysqlhotcopy presence.

Updated the result files for ndb test cases.

Parts that aren't supposed to work on Windows moved to the separate
mysql_not_windows.test.

Before this fix, some tests failed due to lack of instrumentation slots
in the performance schema, because the default sizing was too low.

Now that more code has been instrumented, the default sizing has to be adjusted
to match the current instrumentation consumption.

This change:
- increases the number of rwlock classes from 20 to 30,
- increases the number of rwlock and mutex instances to 1 million.
Both are to account for the volume of data instrumented
when the innodb storage engine is used (because of the innodb buffer pool).

Adjusted the test output accordingly.

with two connections doing LOCK TABLE+INSERT DELAYED".

Disabled --ps-protocol for this part of the test as INSERT
DELAYED simply doesn't work with it under LOCK TABLES.

             LOCK TABLE+INSERT DELAYED

The problem was that the server could crash if the insert delayed
handler thread was killed due to a conflicting shared metadata
lock. This could happen because the metadata lock ticket was
added to the handler thread before it was properly initialized.

This patch moves the cloning of the acquired metadata lock ticket
until after the handler thread has been properly initialized.

The Item_cache_datetime::val_str function wasn't taking into account that time
could be negative. This led to failed assertion.
Now Item_cache_datetime::val_str correctly converts negative time values
from integer to string representation.

The problem was that deadlocks involving INSERT DELAYED were not detected.

The reason for this is that two threads are involved in INSERT DELAYED:
the connection thread and the handler thread. The connection thread would
wait while the handler thread acquired locks and opened the table.
In essence, this adds an edge to the wait-for-graph between the 
connection thread and the handler thread that the deadlock detector is
unaware of. Therefore many deadlocks involving INSERT DELAYED were not 
detected.

This patch fixes the problem by having the connection thread acquire the
metadata lock the table before starting the handler thread. This allows the
deadlock detector to detect any possible deadlocks resulting from trying to
acquire a metadata lock the table. If a metadata lock is successfully acquired,
the handler thread is started and given a copy of the ticket representing the
metadata lock. When the handler thread then tries to lock and open the table,
it will find that it already has the metadata lock and therefore not acquire
any new metadata locks.

Test cases added to delayed.test.

      
Problem: ENUM columns are sorted and distributed according to their
numeric value, but Field::hash() incorrectly passed string character set
(utf32) in combination with numeric value to the hash function,
which made assertion fail.

Fix: pass "binary" character set in combination with numeric value
to the hash function.

  mysql-test/suite/parts/r/part_ctype_utf32.result
  Adding tests

  mysql-test/suite/parts/t/part_ctype_utf32.test
  Adding test

  sql/field.cc
  Pass correct character set pointer to the hash function.

The include/mysqlhotcopy.inc had an error in the 'if' condition, so it failed
if the mysqlhotcopy tool was found.

per-file comments:
  mysql-test/include/mysqlhotcopy.inc
        test should proceed exactly if the mysqlhotcopy was set.
  mysql-test/mysql-test-run.pl
        don't set the MYSQL_HOTCOPY variable if no mysqlhotcopy was found.

Recording fixed correct results results.

my_thread_global_end() now sets mysql_thread_basic_global_init_done= 0
to ensure destroyed mutexes are not reused.

I verified that clearing this flag will not result in the redundant allocation
of other resources allocated by my_thread_global_init() and
my_thread_basic_global_init().

The ALTER PARTITION and SELECT seemed to be deadlocked
when having innodb_thread_concurrency = 1.

Problem was that there was unreleased latches
in the ALTER PARTITION thread which was needed
by the SELECT thread to be able to continue.

Solution was to release the latches by commit 
before requesting upgrade to exclusive MDL lock.

Updated according to reviewers comments (3).