[OS/2] Bug 451686: fix build break and fastcall warnings in js/src, r=shaver

js/src/jscntxt.h

@@ -99,7 +99,7 @@ namespace nanojit {
     class Fragmento;
 }
 class TraceRecorder;
-extern "C++" template<typename T> class Queue;
+extern "C++" { template<typename T> class Queue; }
 typedef Queue<uint16> SlotList;
 class TypeMap;
 

js/src/jstypes.h

@@ -163,7 +163,7 @@
 
 #if defined(_MSC_VER) && defined(_M_IX86)
 #define JS_FASTCALL __fastcall
-#elif defined(__GNUC__) && defined(__i386__)
+#elif (__GNUC__ >= 4) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) && defined(__i386__)
 #define JS_FASTCALL __attribute__((fastcall))
 #else
 #define JS_FASTCALL