linux-headers: add patch version 3

https://bugs.gentoo.org/show_bug.cgi?id=527548
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo/src/patchsets/gentoo-headers/3.17/00_all_0008-x86-do-not-build-relocs-tool-when-installing-headers.patch?revision=1.1
Merge branch 'master' of git.funtoo.org:funtoo-toolchain-overlay