Add import to support latest NDK

To fix the "Can't resolve variable 'memset'" errors that were happening after upgrading to latest Android Studio and NDK.

Author: YoniTsafir

Superpowered/AndroidIO/SuperpoweredAndroidAudioIO.cpp

@@ -5,6 +5,7 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <cstring>
 
 #define NUM_CHANNELS 2