drm-tests: rename pc file from libgbm.pc to gbm.pc

this is to fix build after CL:229186

BUG=chromium:432325
TEST=emerge-link_freon drm-tests

Change-Id: I9abee40285a888d61b753dc4df0b8683bdb67fd0
Reviewed-on: https://chromium-review.googlesource.com/229794
Reviewed-by: Haixia Shi <hshi@chromium.org>
Commit-Queue: Haixia Shi <hshi@chromium.org>
Tested-by: Haixia Shi <hshi@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
1 file changed