Implement JASCriticalSection with a regular mutex

libs/JSystem/include/JSystem/JAudio2/JASCriticalSection.h

@@ -8,12 +8,18 @@
  * 
  */
 class JASCriticalSection {
+public:
+#if TARGET_PC
+    JASCriticalSection();
+    ~JASCriticalSection();
+#else
 public:
     JASCriticalSection() { mInterruptState = OSDisableInterrupts(); };
     ~JASCriticalSection() { OSRestoreInterrupts(mInterruptState); };
 
 private:
     u32 mInterruptState;
+#endif
 };
 
 #endif /* JASCRITICALSECTION_H */