qemu: fix pkg-config usage

This is fixed in latest Gentoo ebuilds already.

BUG=chromium:985180
TEST=CQ passes

Change-Id: Iaed657ef3de4980f4b755dba609324e3ec14ac88
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2213917
Reviewed-by: Alex Klein <saklein@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed