* gnu/packages/make-bootstrap.scm (gcc-static): Use gcc-5. This fixes
building libstdc++-boot0 with a newly built %bootstrap-gcc.
(%gcc-stripped): Likewise.
(gcc-for-bootstrap): Likewise.
* gnu/packages/patches/gcc-5-hurd.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gcc.scm (gcc-5): Use it.
