minigbm: Set library soname to libgbm.so.1 during link

The soname needs to match mesa exactly. The actual library is installed
as libminigbm.so.1.0.0 - this filename does not matter, and it is
probably better to be specific.

BUG=chromium:446653
TEST=chrome built against mesa boots with minigbm &
 chrome built against minigbm boots with minigbm

Change-Id: Id031cc1eb63ab27df57ef9e0313994723e24987c
Reviewed-on: https://chromium-review.googlesource.com/244782
Reviewed-by: Haixia Shi <hshi@chromium.org>
Tested-by: Michael Spang <spang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
1 file changed