a few depend:-related thingies that were still in.

okay millert@, tb@

Set the permissions of the specs file explicitly so that they don't
depend on the umask. Install headers and info files with group bin
like all the other headers and info files.

ok stefan

Import a BSD make based infrastructure for building gcc, based on the
same solution from FreeBSD.
Don't even try to build it at the moment. This is commited so people can
work on it in tree.