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libgcc of the gcc being built, not the gcc building it. * Only include a directory in the rpath of an executable/library if it is actually used. Before, the `/lib' directory of every build input was added to the rpath, causing many unnecessary retained dependencies. For instance, Perl has a `/lib' directory, but most applications whose build process uses Perl don't actually link against Perl. (Also added a test for this.) * After building glibc, remove glibcbug, to prevent a retained dependency on gcc. * Add a newline after `building X' in GNU Make. svn path=/nixpkgs/trunk/; revision=911