Partly addresses <http://bugs.gnu.org/24703>.
Reported by Mark H Weaver <mhw@netris.org>.
* gnu/packages/patches/gcc-strmov-store-file-names.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gcc.scm (gcc-5)[sources](patches): Add it.
(gcc-6)[sources](patches): Add it.
