w32: Fix arguments for GetProcessAffinityMask, SetProcessAffinityMask

These functions take arguments of type PDWORD_PTR which is a
pointer to a DWORD_PTR, not a pointer to a DWORD.

Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

os-win32.c

@@ -180,7 +180,7 @@ void os_setup_early_signal_handling(void)
     /* Note: cpu_interrupt() is currently not SMP safe, so we force
        QEMU to run on a single CPU */
     HANDLE h;
-    DWORD mask, smask;
+    DWORD_PTR mask, smask;
     int i;
 
     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);