Bug 1038492 - Cherry-pick libyuv's fix for clang-cl compatibility; r=jesup

This imports the following upstream change:
https://code.google.com/p/libyuv/source/detail?r=1033

media/libyuv/include/libyuv/row.h

@@ -38,7 +38,8 @@ extern "C" {
   var = 0
 
 #if defined(__pnacl__) || defined(__CLR_VER) || defined(COVERAGE_ENABLED) || \
-    defined(TARGET_IPHONE_SIMULATOR)
+    defined(TARGET_IPHONE_SIMULATOR) || \
+    (defined(_MSC_VER) && defined(__clang__))
 #define LIBYUV_DISABLE_X86
 #endif
 // True if compiling for SSSE3 as a requirement.

media/libyuv/include/libyuv/video_common.h

@@ -115,7 +115,7 @@ enum FourCC {
   FOURCC_H264 = FOURCC('H', '2', '6', '4'),
 
   // Match any fourcc.
-  FOURCC_ANY  = 0xFFFFFFFF,
+  FOURCC_ANY = -1,
 };
 
 enum FourCCBpp {

media/libyuv/source/cpu_id.cc

@@ -10,7 +10,7 @@
 
 #include "libyuv/cpu_id.h"
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
 #include <intrin.h>  // For __cpuidex()
 #endif
 #if !defined(__pnacl__) && !defined(__CLR_VER) && \
@@ -48,7 +48,7 @@ extern "C" {
     defined(__i386__) || defined(__x86_64__))
 LIBYUV_API
 void CpuId(uint32 info_eax, uint32 info_ecx, uint32* cpu_info) {
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && !defined(__clang__)
 #if (_MSC_FULL_VER >= 160040219)
   __cpuidex((int*)(cpu_info), info_eax, info_ecx);
 #elif defined(_M_IX86)