fix mtr (empty argument passed to mysqld)

(ncurses-devel or bison)

Backport from 6.0.14 to 5.6.0

Original code from Guilhem Bichot

Backport from 6.0.14 to 5.6.0

Original code from Sergei Golubchik

Backport from 6.0.14 to 5.6.0

Original code from Sergei Golubchik

      
Just change mysql_foo to mysql_cv_foo for one cache-id variable name.  There
was only one bad variable name, present in 5.0 and 5.1, but not in the -pe
branch.


Backported to 5.6.0  (mysql-next-mr-runtime)

           STRING_RESULT argument

There is a "magic" number for precision : NOT_FIXED_DEC. 
This means that the precision is not a fixed number.
But this constant was re-defined in several files and 
was not available to the UDF developers.
 
Moved the NOT_FIXED_DEC definition to the correct header
and removed the redundant definitions.

Backported to 5.6.0  (mysql-next-mr-runtime)

Add result file format v2

Backport to 5.6.0   

Add support for being prompted for new passwords by mysqladmin instead of
specifying them on the command line. (Bug #5724, patch by Harrison Fisk)

(From: gkodinov)
Use and int * where possible to scan for trailing space in a
string instead of always iterating char-by-char.
Using the attached benchmark file on a 32 bit Intel Core 2 
Duo CPU I've got 43485 ms run with the fix compared to 44373 
without it.

Backported to 5.6.0 (next-mr-runtime)
6.0-codebase revid: 2476.1362.1

correctly specify working directory for dtrace_prelink. Also, generate _dtrace.o in the object directory