SDL_image: Bump libwebp

From f00b607dd86896782f95233a20862ba42c6e0972 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Tue, 11 Oct 2022 21:52:20 +0200
Subject: [PATCH] Bump libwebp

---
 external/libwebp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/libwebp b/external/libwebp
index d13b8dbe..12cf7b31 160000
--- a/external/libwebp
+++ b/external/libwebp
@@ -1 +1 @@
-Subproject commit d13b8dbe45a01df15c3896203f7734abc35230c8
+Subproject commit 12cf7b315fb7a9df56fa6b8ee30e36312659d63c