Fix signature of the waveInProc/waveOutProc callbacks.

Parameters are DWORD_PTR instead of DWORD, which did not matter
on 32bit but caused MinGW64-compiler warnings and potential
crashes on 64bit.

Change-Id: I840ae3ea7ea532746f73f20b3233cae842931d45
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/multimedia/audio/qaudioinput_win32_p.h

@@ -139,7 +139,7 @@ private:
 
     QMutex mutex;
     static void QT_WIN_CALLBACK waveInProc( HWAVEIN hWaveIn, UINT uMsg,
-            DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 );
+            DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2 );
 
     WAVEHDR* allocateBlocks(int size, int count);
     void freeBlocks(WAVEHDR* blockArray);