DBD::mysql patches

Just a list of minor patches to Patrick Galbraith's work on DBD::mysql:

For DBD-mysql 4.004:

• mysql-warning-count-4.004.patch (PGP sig) — stub mysql_warning_count() for MySQL earlier than 4.1 (#25713)
• realclean-mstate-4.004.patch (PGP sig) — make the “realclean” target also remove the autogenerated t/mysql.mtest file (#25714)
• sqlstate-purge-4.004.patch (PGP sig) — finish the ifdefs removal from dbdimp.c (#25671)

For DBD-mysql 4.003:

• sqlstate-purge-4.003.patch (PGP sig) — finish the ifdefs removal from dbdimp.c (#25671)