minijail: Create a pkgconfig file for libminijail.

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: I4b44174ae115a93fb9d4299ca24002f9ad37ba6c
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>
2 files changed