configure: Make sure mysql libs/cflags aren't used if they don't work.
configure: Make sure mysql libs/cflags aren't used if they don't work.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot