Fixed compilation error on mingw. Used _MSC_VER for MSVC-specific code instead of WIN32. Recieved patch from cjacek.
BUG=12
Review URL: http://codereview.appspot.com/1694049

git-svn-id: https://angleproject.googlecode.com/svn/trunk@343 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/compiler/preprocessor/scanner.c b/src/compiler/preprocessor/scanner.c
index 14eee59..0944da5 100644
--- a/src/compiler/preprocessor/scanner.c
+++ b/src/compiler/preprocessor/scanner.c
@@ -83,15 +83,15 @@
 
 #define EOL_SY '\n'
 
-#if defined(_WIN32)
+#if defined(_MSC_VER)
     #define DBG_BREAKPOINT() __asm int 3
-    #elif defined(_M_AMD64)
+#elif defined(_M_AMD64)
     #define DBG_BREAKPOINT() assert(!"Dbg_Breakpoint");
-    #else
+#else
     #define DBG_BREAKPOINT()
-    #endif
+#endif
 
-    #if defined(_WIN32) && !defined(_M_AMD64)
+#if defined(_MSC_VER) && !defined(_M_AMD64)
     __int64 RDTSC ( void ) {
 
         __int64 v;