BUILD: libgifcodec: fix flutter build

Cq-Include-Trybots: luci.skia.skia.primary:Build-Debian9-Clang-arm-Release-Flutter_Android
Change-Id: If6790e7084f2cc8a9acf759184a52d1fdcb9b793
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255531
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed