Authored by Bogdan Poplauschi

Bumped the libwebp reference to 0.4.4

libwebp @ 1525784d
1 -Subproject commit 326b5fb863a43ab8cb225bca913e9025f727f078 1 +Subproject commit 1525784d5bc1d9e7e74ff18f9d21a910b60552af