x11-libs/arc-libdrm: Enable support for multilib

Bump EAPI to 5, enable XORG_MULTILIB, add multilib ABI flags to
dependencies and stop overriding library path.

BUG=b:36540057
TEST=emerge-reef arc-libdrm

Change-Id: Id6e42156ea7ca0248052245a17831c446934ed9e
Reviewed-on: https://chromium-review.googlesource.com/488747
Commit-Ready: Tomasz Figa <tfiga@chromium.org>
Tested-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed