Merge "Enable vendor variant of libgif static library" am: 8697006065

Original change: https://android-review.googlesource.com/c/platform/external/giflib/+/2309527

Change-Id: I51fc7d33de4e50021132c0e11a07b717ed6349fe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>