Use force_align_arg_pointer for QSA

Alc/backends/qsa.c

@@ -175,6 +175,14 @@ static DevMap* deviceList(int type, ALuint* count)
     return dev_list;
 }
 
+/* force_align_arg_pointer is required for proper function arguments */
+/* aligning, when SSE mixer is used. QNX has a bug in pthread_create */
+/* function regarding thread stack alignment, it uses 64 bit align   */
+/* instead of 128 bit, like main thread.                             */
+#if defined(__GNUC__) && (_NTO_VERSION <= 650) && \
+    defined(__i386__) && defined(HAVE_SSE)
+__attribute__((force_align_arg_pointer))
+#endif /* __GNUC__ && QNX version < 6.5.0 on x86 platform with SSE support */
 static ALuint qsa_proc_playback(ALvoid* ptr)
 {
     ALCdevice* device=(ALCdevice*)ptr;