sys-devel/arc-build: Fix pkg-config invocation

The installed pkg-config script directly invokes the unprefixed
pkg-config, which is violating the rule.

BUG=b:174999993,chromium:985180
TEST=emerge-asurada arc-build arc-mali-drivers-valhall

Change-Id: I715aeb243356bb885eed609c1ac3859df2665f01
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2593787
Tested-by: Fei Shao <fshao@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Nicolas Boichat <drinkcat@chromium.org>
2 files changed