Remove libgifcodec from skottiekit build.

GIF decoding is not needed, saves another 5.5k on the brotli compressed binary

Change-Id: I4bc5f3e7bed83c190a73cb19dfb59f89fcc76cd8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285826
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Nathaniel Nifong <nifong@google.com>

experimental/skottiekit/compile.sh

@@ -119,6 +119,7 @@ echo "Compiling bitcode"
   skia_use_freetype=false \
   skia_use_harfbuzz=false \
   skia_use_icu=false \
+  skia_use_libgifcodec=false \
   skia_use_libheif=false \
   skia_use_libjpeg_turbo_decode=true \
   skia_use_libjpeg_turbo_encode=false \