Fix webp compile warnings on windows
This fix was landed with:
https://codereview.chromium.org/1280073002/
The above CL was reverted due to an unrelated bug in libwebp.
The above CL contains multiple components, and I think that
reverting this part of the change was unintentional.
BUG=skia:
Review URL: https://codereview.chromium.org/1286903003
diff --git a/third_party/libwebp/webp/config.h b/third_party/libwebp/webp/config.h
index 62ade94..b01473c 100644
--- a/third_party/libwebp/webp/config.h
+++ b/third_party/libwebp/webp/config.h
@@ -14,14 +14,14 @@
// file, which replaces the checks in endian_inl.h to decide whether we have
// particular builtins.
-#ifdef __builtin_bswap64(x)
+#ifdef __builtin_bswap64
#define HAVE_BUILTIN_BSWAP64
#endif
-#ifdef __builtin_bswap32(x)
+#ifdef __builtin_bswap32
#define HAVE_BUILTIN_BSWAP32
#endif
-#ifdef __builtin_bswap16(x)
+#ifdef __builtin_bswap16
#define HAVE_BUILTIN_BSWAP16
#endif