pypy3-exe: Add patch to respect system PKG_CONFIG

Our build environment requires the usage of wrapped pkg-config instances
corresponding to build targets. This patch allows the pypy3 build to
read the PKG_CONFIG environment variable to respect that requirement.

Upstream Gentoo PR: https://github.com/gentoo/gentoo/pull/17090

BUG=chromium:1114277
TEST=`emerge pypy3-exe`

Change-Id: I946fc9db2cce74aaf5f8ac1f5748a8bad5cae98e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2343732
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
2 files changed