trunks: add library pkg-config file

Add a template to generate a pkg-config .pc file for libtrunks,
in order to use more easily the shared library (e.g. from D-BUS client).

BUG=b:35545754
TEST=emerge-eve trunks && pkg-config-eve --libs libtrunks

Change-Id: Ief76db867b9132a18621573c3fa0c782083c3de8
Reviewed-on: https://chromium-review.googlesource.com/537013
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed