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>
diff --git a/sys-devel/arc-build/arc-build-0.0.3-r16.ebuild b/sys-devel/arc-build/arc-build-0.0.3-r17.ebuild
similarity index 100%
rename from sys-devel/arc-build/arc-build-0.0.3-r16.ebuild
rename to sys-devel/arc-build/arc-build-0.0.3-r17.ebuild
diff --git a/sys-devel/arc-build/arc-build-0.0.3.ebuild b/sys-devel/arc-build/arc-build-0.0.3.ebuild
index 98ef4e9..0c64996 100644
--- a/sys-devel/arc-build/arc-build-0.0.3.ebuild
+++ b/sys-devel/arc-build/arc-build-0.0.3.ebuild
@@ -53,7 +53,7 @@
 # Undo that logic.
 unset PKG_CONFIG_PATH
 
-exec pkg-config "\$@"
+exec /usr/bin/pkg-config "\$@"
 EOF
 }