Log Message:
lang/gcc45: Mark NOT-FOR-DRAGONFLY

This compiler requires binutils 2.17 which A) doesn't build on DragonFly
and B) is a significant downgrade over the system binutils.  DragonFly
users should look at lang/gnat-aux for a pkgsrc compiler which is based
on gcc 4.6.  lang/gcc46 doesn't build on DragonFly either, but it may be
worth fixing that package.  This one isn't worth the effort for us.