WITH_LIBGCC %define, it isn't subject to shell rules and is
parsed anyway.  Instead create a file with optional files to
include.

setup for now, leave large changes to later.

Can't see how mysqld_safe can work with current setup, so make it look
in $pkglibdir/mysql too.

Other cleanups.

Remove libmysqld-debug.a, it doesn't exist in current packages?

flags are being used correctly.

Don't create empty ChangeLog.