- disable AMR codec for OpenWRT for now

src/engine/media/MT_AmrCodec.cpp

@@ -1,5 +1,5 @@
 // Avoid linking issues on Android systems
-#if !defined(TARGET_ANDROID)
+#if !defined(TARGET_ANDROID) && !defined(TARGET_OPENWRT)
 
 #include "MT_AmrCodec.h"
 #include "../helper/HL_ByteBuffer.h"
@@ -976,4 +976,4 @@ int GsmEfrCodec::plc(int lostFrames, void* output, int outputCapacity)
     return lostFrames * pcmLength();
 }
 
-#endif
+#endif