Merge "Start restricting giflib visibility." into main am: 3251f7d49d am: 74326dd7c9

Original change: https://android-review.googlesource.com/c/platform/external/giflib/+/3269773

Change-Id: Id655e04dde95a9cd881cd76e55849d0814b5a6bb
Signed-off-by: Automerger Merge Worker <[email protected]>