mingw fix ifdefs to use gcc source

mingw gcc sets the macro _M_IX86 which is normally only set
by Visual C and clangcl which are Visual C style source code
style for assembly, but gcc is not Visual C compatible.
Add _MSC_VER to most ifdefs to detect that its really Visual C
or clangcl and not mingw gcc so the gcc source code will be used.

Bug: libyuv:744
Test: CXXFLAGS=-m32 CXX=~/prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8/bin/x86_64-w64-mingw32-g++ make -f linux.mk
Change-Id: I3431aa486eb769b145faa8d5eb75ed639f9d6f5e
Reviewed-on: https://chromium-review.googlesource.com/722319Reviewed-by: Cheng Wang <wangcheng@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1674
+Version: 1675
 License: BSD
 License File: LICENSE
 

include/libyuv/rotate_row.h

@@ -29,7 +29,7 @@ extern "C" {
 #endif
 #endif
 // The following are available for Visual C and clangcl 32 bit:
-#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86)
+#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && defined(_MSC_VER)
 #define HAS_TRANSPOSEWX8_SSSE3
 #define HAS_TRANSPOSEUVWX8_SSE2
 #endif

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1674
+#define LIBYUV_VERSION 1675
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_

source/compare_win.cc

@@ -23,7 +23,7 @@ extern "C" {
 #endif
 
 // This module is for 32 bit Visual C x86 and clangcl
-#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86)
+#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && defined(_MSC_VER)
 
 uint32 HammingDistance_X86(const uint8* src_a, const uint8* src_b, int count) {
   uint32 diff = 0u;

source/rotate_win.cc

@@ -17,7 +17,7 @@ extern "C" {
 #endif
 
 // This module is for 32 bit Visual C x86 and clangcl
-#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86)
+#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && defined(_MSC_VER)
 
 __declspec(naked) void TransposeWx8_SSSE3(const uint8* src,
                                           int src_stride,

source/scale_win.cc

@@ -17,7 +17,7 @@ extern "C" {
 #endif
 
 // This module is for 32 bit Visual C x86 and clangcl
-#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86)
+#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && defined(_MSC_VER)
 
 // Offsets for source bytes 0 to 9
 static uvec8 kShuf0 = {0,   1,   3,   4,   5,   7,   8,   9,