use of pkg_*_pre.conf instead of parse-config
and options to build gcc{2,3,3.3} objc with gc, and options to build their java wth system boehms instead of the old included version.
and makes it not install doc itself
testes finished for gcc2 and gcc33... test for gcc3 still in progress but looks good.


git-svn-id: http://www.rocklinux.org/svn/rock-linux/trunk@1304 c5f82cb5-29bc-0310-9cd0-bff59a50e3bc