libbpf: export PKG_CONFIG

Export PKG_CONFIG using tc-export so that libbpf's Makefile will invoke
a target specific pkg config wrapper.

BUG=b:244636155
TEST=Emerged the SDK without errors

Change-Id: Iee67a723ec5ab5f01f62c893dbae713bd47eca1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3869255
Tested-by: Aashay Shringarpure <aashay@google.com>
Reviewed-by: Aashay Shringarpure <aashay@google.com>
Commit-Queue: Jason Ling <jasonling@chromium.org>
1 file changed