code backported from 6.0


per-file messages:
  include/my_global.h
    Remove SC_MAXWIDTH. This is unused and irrelevant nowadays.
  include/my_sys.h
    Remove errbuf declaration and unused definitions.
  mysys/my_error.c
    Remove errbuf definition and move and adjust ERRMSGSIZE.
  mysys/my_init.c
    Declare buffer on the stack and use my_snprintf.
  mysys/safemalloc.c
    Use size explicitly. It's more than enough for the message at hand.
  sql/sql_error.cc
    Use size explicitly. It's more than enough for the message at hand.
  sql/sql_parse.cc
    Declare buffer on the stack. Use my_snprintf as it will result in
    less stack space being used than by a system provided sprintf --
    this allows us to put the buffer on the stack without causing much
    trouble. Also, the use of errbuff here was not thread-safe as the
    function can be entered concurrently from multiple threads.
  sql/sql_table.cc
    Use MYSQL_ERRMSG_SIZE. Extra space is not needed as my_snprintf will
    nul terminate strings.
  storage/myisam/ha_myisam.cc
Use MYSQL_ERRMSG_SIZE.
  sql/share/errmsg.txt
    Error message truncation in test "innodb" in embedded mode
    filename in the error message can safely take up to 210 symbols.

Remove size of binlog file from SHOW BINARY LOGS. 
Changing size of binlog file is an affect of adding or removing events to/from
binlog and it can be checked in next command of test: SHOW BINLOG EVENTS.
For SHOW BINARY LOGS statement enough to show the list of file names.

fixed federated warnings

Changed [ skip ] to [ skipped ] and removed optional .

  1 - MASTER_MYSOCK fixed inexistent environment variable.
  2 - Fixed mismatch in result files due to changes in MTR.

      
It seems that the length of the thick line printed by mtr when printing the 
suite name differs from mtr1 and mtr2, affecting the mtr filtering by PB2.
      
This patch addresses it by restoring the thick line length to 78 (original
length) instead of 60 (the one in mtr2).

      
The test case proposed by the bugfix fails in bugteam trees after merging new 
mtr from main. The failure is due to the fact that the binlog file location has
changed and is no more under $MYSQLTEST_VARDIR/log.
      
This patch fixes the test failure by setting the correct path to the binlog 
file.

test case was executed.

test case was executed.

conflicts:
  Text conflict in mysql-test/suite/sys_vars/r/rpl_max_binlog_size_func.result
  Text conflict in mysql-test/suite/sys_vars/t/rpl_max_binlog_size_func.test

 - Increase number of transaction objects available in ndbd
 - Most likely this is a timing related issue.

Temporarily blocking to run the test on windows.

Todo: remove the include upon setup_fake_relay_log has been fixed.

BUG#41003 reached our trees.