Prep to remove API-related #defines from voice_engine_configurations.h

webrtc/voice_engine/voe_rtp_rtcp_impl.cc

Index: webrtc/voice_engine/voe_rtp_rtcp_impl.cc
diff --git a/webrtc/voice_engine/voe_rtp_rtcp_impl.cc b/webrtc/voice_engine/voe_rtp_rtcp_impl.cc
index 44e571b2328960ae9a82867622aa663261d28af1..20f2caf1acde406648006ee4f3ce77d3b1189435 100644
--- a/webrtc/voice_engine/voe_rtp_rtcp_impl.cc
+++ b/webrtc/voice_engine/voe_rtp_rtcp_impl.cc
@@ -17,6 +17,10 @@
 #include "webrtc/voice_engine/channel.h"
 #include "webrtc/voice_engine/transmit_mixer.h"
 
+#ifndef WEBRTC_VOICE_ENGINE_RTP_RTCP_API
+#error "Deprecated"
+#endif
+
 namespace webrtc {
 
 VoERTP_RTCP* VoERTP_RTCP::GetInterface(VoiceEngine* voiceEngine) {