Add static library to Makefile

These are used when building minigbm for crosvm for unit and integration
tests. See: https://crrev.com/c/3141771

BUG=b:196059146
TEST=make CC_STATIC_LIBRARY(libminigbm.pie.a)

Change-Id: I819fcd2f3ec4969139825ffdc323e54e8b2eeab9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/3141018
Reviewed-by: Gurchetan Singh <[email protected]>
Reviewed-by: Daniel Verkamp <[email protected]>
Tested-by: Dennis Kempin <[email protected]>
Commit-Queue: Dennis Kempin <[email protected]>
1 file changed