Update Wuffs version

Bug: skia:8764
Bug: skia:8767
Bug: skia:8764

This pulls in the Wuffs bug fix:
https://github.com/google/wuffs/commit/ab7d6de3180b734169f48b5a3a4fda7a363cc083
"Let Wuffs compile with MSVC (Microsoft Visual C++)".

This also pulls in fixes for
https://github.com/google/wuffs/issues/20
"Check for "not enough pixel data" and return an Error or Warning"

Change-Id: Ie75e57504f1ec872418e8851e10de9159f714bc5
Reviewed-on: https://skia-review.googlesource.com/c/193200
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
diff --git a/src/codec/SkWuffsCodec.cpp b/src/codec/SkWuffsCodec.cpp
index 6828899..ad376aa 100644
--- a/src/codec/SkWuffsCodec.cpp
+++ b/src/codec/SkWuffsCodec.cpp
@@ -19,7 +19,7 @@
 // As we have not #define'd WUFFS_IMPLEMENTATION, the #include here is
 // including a header file, even though that file name ends in ".c".
 #include "wuffs-v0.2.c"
-#if WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT < 1605
+#if WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT < 1640
 #error "Wuffs version is too old. Upgrade to the latest version."
 #endif