* distro/base.scm (gcc-4.7): Patch `LIB_SPEC' to add `-rpath' for each
`-L'. Spec string suggested by Marc Glisse <marc.glisse@inria.fr>.
(libtool): Add `libtool-skip-tests.patch'.
* distro/patches/libtool-skip-tests.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.