Log Message:
Tweak (ugly) post-buildlink: hack to only occur if gcc3 is found. Tested on:
    - i386 current (1.6ZE)
    - i386 1.6.2_RC3
    - i386 1.6.2_RC3 with USE_GCC3
Previous version was committed by accident
No change to generated package, only to if package could be generated at all,
so no PKGREVISION change.
Does not fix, but provides a workaround for PR pkg/23053 and PR pkg/23509