Build fixes for MSVC 7.1 and mingw (bug 451881, patch from neil@parkwaycc.co.uk).

js/src/nanojit/LIR.h

@@ -45,7 +45,10 @@ namespace nanojit
 {
 	#define is_trace_skip_tramp(op) ((op) <= LIR_tramp)
 	
-	enum LOpcode __msvc_only(: unsigned)	
+	enum LOpcode
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+          : unsigned
+#endif
 	{
 		// flags; upper bits reserved
 		LIR64	= 0x40,			// result is double or quad

js/src/nanojit/avmplus.h

@@ -48,11 +48,8 @@
 
 #define FASTCALL JS_FASTCALL
 
-#ifdef _MSC_VER
-#define __msvc_only(x)  x
+#ifdef WIN32
 #include <windows.h>
-#else
-#define __msvc_only(x)
 #endif
 
 #ifdef DEBUG