minijail: Create a pkgconfig file for libminijail.

(cherry-picked from
 https://chromium.googlesource.com/a/chromiumos/platform2 at
 50fb55a05efdd0b31dc8dcbb53591bfff68f8703)

This allows us to change the import path of libminijail.h easily.

BUG=None
TEST=`emerge-gizmo apmanager attestation cromo cros-disks debugd
libchromeos lorgnette minijail tpm_manager trunks webserver` works.

CQ-DEPEND=CL:293580

Change-Id: I96a98d9f268fab518c2cc34c3d2ce2c5ae07788b
Reviewed-on: https://chromium-review.googlesource.com/293483
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
Trybot-Ready: Bertrand Simonnet <bsimonnet@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
1 file changed