Restore MYSQL_SYSVAR_UINT64_T and MYSQL_SYSVAR_SIZE_T in
plugin.h

Some Windows enviroments don't have uint64_t, and we dont really need
that type. Assume 64-bit integers take 8 bytes.

remove hard-coded paths (that assumed we're in a source tree)
remove various shell/perl/awk/whatsnot scripts, use mysqltest and perl
remove numerous --exec /some/unix/tool commands, use mysqltest and perl

1. Special mode to search in error logs: if SEARCH_RANGE is not set,
   the file is considered an error log and the search is performed
   since the last CURRENT_TEST: line
2. Number of matches is printed too. "FOUND 5 /foo/ in bar".
   Use greedy .* at the end of the pattern if number of matches
   isn't stable. If nothing is found it's still "NOT FOUND",
   not "FOUND 0".
3. SEARCH_ABORT specifies the prefix of the output.
   Can be "NOT FOUND" or "FOUND" as before,
   but also "FOUND 5 " if needed.

namely, restart_mysqld_with_option.inc and kill_and_restart_mysqld.inc -
use restart_mysqld.inc instead.

Also remove innodb_wl6501_crash_stripped.inc that wasn't used anywhere.

don't use internal server collation symbol names, use collation
properties and collation IDs, they are much more stable.

trx::has_logged_persistent(): Renamed from trx_is_redo_rseg_updated().
Determines if a transaction has generated any persistent undo log.

trx::has_logged(): Renamed from trx_is_rseg_updated().
Determines if a transaction has generated any undo log.

Added CHECK constraints to I_S.TABLE_CONSTRAINTS.
Fixed a bug regarding virtual column definitions whose name is the field name.
Added test case: check_constraint_show

The function Item::split_sum_func2() incorrectly processed the function
items with window functions that were not window functions themselfes
and were used as arguments of other functions.

With the current design the function copy_funcs() should ignore
the items with window functions from the array **func_ptr.

followup for da5c3e03

moved to storage/innobase/

also removed duplicate checks from storage/innobase/CMakeLists.txt
(they're all in storage/innobase/innodb.cmake)

MDEV-11605 Assertion `(longlong) thd->status_var.local_memory_used >= 0 || !debug_assert_on_not_freed_memory' failed in my_malloc_size_cb_func

MyISAM in compute_vcols() - which is used only in mi_check code -
was computing indexed vcols into an internally allocated buffer
(not record[0]) and the buffer was calculated to be long enough to fit
every keyseg (a keyseg knows where its value in a record buffer is
and the length of the value).

This logic didn' work for prefix keys, because the keyseg length is the
length of a prefix, but the record buffer needs to fit the complete
value of a vcol. In this bug MyISAM was writing a 2K varchar
into a buffer too short.

Also it didn't work for repair-with-keycache, because that code
recalculats all vcols, not only indexed ones.

So, the buffer size (MYISAM_SHARE::vreclength) should include all
vcols' full lengths. But it was calculated in mi_open and low-level
MyISAM code has no knowledge of vcols.

As a fix we now recalculate MYISAM_SHARE::vreclength in
ha_myisam::setup_vcols_for_repair() which is always called
before compute_vcols().

MDEV-10354 Assertion `! is_set()' failed in Diagnostics_area::set_ok_status on CREATE TABLE with invalid default

test case

MDEV-11114 Cannot drop column referenced by CHECK constraint: Unknown column 'a' in 'virtual column function'

clarify the error message

add columns needed for CHECK constraints not only to read_set,
but also to vcol_set.

give threads more descriptive names

don't build the server with jemalloc.
only build tokudb with it.
move tokudb into a separate package, because it brings a new dependency

disable XtraDB in a way that makes it impossible to be built

* remove redundant casts
* fix fix_win_paths() not to pretend that it takes const char* string
  because it changes it. Fix its callers not to pass const strings
  into it.
* use _WIN32 not __WIN__