chromeos-chrome: add host_pkg_config for cross-compilation

This new build variable ensures that host-only compilation helpers
aren't incorrectly linked against libraries in the current board
sysroot.

BUG=chromium:710841
TEST=cbuildbot kevin-release

Change-Id: Ifc667fd55cfaa00e2721c7894684909b6bd08b46
Reviewed-on: https://chromium-review.googlesource.com/483342
Commit-Ready: Richard Townsend <richard.townsend@arm.com>
Tested-by: Richard Townsend <richard.townsend@arm.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed