Update to the 20050511 snapshot of GCC 3.3.6.
Add conflicts with the gcc40 and gcc41 ports, due to the .info files.
Simplify the handling of libraries which are not installed in all
No longer install fsf-funding.7 gfdl.7 gpl.7, remove some cruft from
the post-install target, and simplify generation of the dynamic parts
of the packaging list.