- always link AMR & Opus codecs; it reduces number of problems during builds.

src/engine/media/MT_Statistics.cpp

@@ -258,9 +258,7 @@ Statistics& Statistics::operator += (const Statistics& src)
         if (src.mFirstRtpTime.is_initialized())
             mFirstRtpTime = src.mFirstRtpTime;
 
-#if defined(USE_AMR_CODEC)
     mBitrateSwitchCounter += src.mBitrateSwitchCounter;
-#endif
     mRemotePeer = src.mRemotePeer;
     mSsrc = src.mSsrc;