Mingw xgetbv use gcc assembly not visual c.

BUG=349
TESTED=c:\mingw64\bin\x86_64-w64-mingw32-c++.exe -m32 -I include source/cpu_id.cc -c -o cpu_id.o
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/17139004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1049 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1048
+Version: 1049
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1048
+#define LIBYUV_VERSION 1049
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/cpu_id.cc

@@ -97,7 +97,7 @@ int TestOsSaveYmm() {
   uint32 xcr0 = 0u;
 #if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
   xcr0 = (uint32)(_xgetbv(0));  // VS2010 SP1 required.
-#elif defined(_M_IX86)
+#elif defined(_M_IX86) && defined(_MSC_VER)
   __asm {
     xor        ecx, ecx    // xcr 0
     _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0  // For VS2010 and earlier.