build/SConstruct:
Only the major and minor mysql version numbers are guaranteed
to be integers (e.g. 4.1.10a), and since that's all we care about
only try to deal with those.
for older versions of mysql, the strings returned by mysql_config may
have quotes in them, remove those so things work
--HG--
extra : convert_revision : de32f3e76618f0caf4d5578edd61beaeef666eb6