portage-stable: pull upstream cmake-multilib.eclass.

We need the updated cmake-multilib.eclass to build
libcxxabi.

BUG=chromium:620402
TEST=cbuildbot falco-release elm-release daisy-release
     sudo emerge libcxxabi

Change-Id: I4b3a95a3323bd2dd1b46ca4c0905e874b5c5eb5c
Reviewed-on: https://chromium-review.googlesource.com/463926
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed