Adding mingw support to js.

Bug #134113 r=brendan

js/src/jslong.h

@@ -76,7 +76,7 @@ extern JS_PUBLIC_API(JSInt64) JSLL_Zero(void);
 
 #if JS_BYTES_PER_LONG == 8
 #define JSLL_INIT(hi, lo)  ((hi ## L << 32) + lo ## L)
-#elif defined(WIN32) || defined(WIN16)
+#elif (defined(WIN32) || defined(WIN16)) && !defined(__GNUC__)
 #define JSLL_INIT(hi, lo)  ((hi ## i64 << 32) + lo ## i64)
 #else
 #define JSLL_INIT(hi, lo)  ((hi ## LL << 32) + lo ## LL)

js/src/jsnum.c

@@ -438,7 +438,7 @@ static JSConstDoubleSpec number_constants[] = {
 
 static jsdouble NaN;
 
-#if !defined __MWERKS__ && defined XP_PC && (defined _M_IX86 || defined __GNUC__)
+#if !defined __MWERKS__ && defined XP_PC && (defined _M_IX86 || (defined __GNUC__ && !defined(__MINGW32__)))
 
 /*
  * Set the exception mask to mask all exceptions and set the FPU precision

js/src/jstypes.h

@@ -143,7 +143,7 @@
 #endif
 
 #ifdef _WIN32
-#  ifdef __MWERKS__
+#  if defined(__MWERKS__) || defined(__GNUC__)
 #    define JS_IMPORT_API(__x)      __x
 #  else
 #    define JS_IMPORT_API(__x)      __declspec(dllimport) __x
@@ -304,7 +304,7 @@ typedef unsigned long JSUint64;
 #elif defined(WIN16)
 typedef __int64 JSInt64;
 typedef unsigned __int64 JSUint64;
-#elif defined(WIN32)
+#elif defined(WIN32) && !defined(__GNUC__)
 typedef __int64  JSInt64;
 typedef unsigned __int64 JSUint64;
 #else