Don't link with audio codecs that we don't use

webrtc/modules/audio_coding/main/test/TestRedFec.cc

Index: webrtc/modules/audio_coding/main/test/TestRedFec.cc
diff --git a/webrtc/modules/audio_coding/main/test/TestRedFec.cc b/webrtc/modules/audio_coding/main/test/TestRedFec.cc
index a48b2ebdfec97d24a8f8c24537de6aa8f50ed576..7a512b443337a899709e6ead4eaa42c858b8d7bd 100644
--- a/webrtc/modules/audio_coding/main/test/TestRedFec.cc
+++ b/webrtc/modules/audio_coding/main/test/TestRedFec.cc
@@ -37,11 +37,15 @@ namespace webrtc {
 namespace {
   const char kNameL16[] = "L16";
   const char kNamePCMU[] = "PCMU";
+  const char kNameCN[] = "CN";
+  const char kNameRED[] = "RED";
+
+  // These three are only used by code #ifdeffed on WEBRTC_CODEC_G722.
+#ifdef WEBRTC_CODEC_G722
   const char kNameISAC[] = "ISAC";
   const char kNameG722[] = "G722";
   const char kNameOPUS[] = "opus";
-  const char kNameCN[] = "CN";
-  const char kNameRED[] = "RED";
+#endif
 }
 
 TestRedFec::TestRedFec()
@@ -104,7 +108,7 @@ void TestRedFec::Perform() {
   EXPECT_TRUE(false);
   printf("G722 needs to be activated to run this test\n");
   return;
-#endif
+#else
   EXPECT_EQ(0, RegisterSendCodec('A', kNameG722, 16000));
   EXPECT_EQ(0, RegisterSendCodec('A', kNameCN, 16000));
 
@@ -408,6 +412,8 @@ void TestRedFec::Perform() {
   EXPECT_FALSE(_acmA->REDStatus());
   EXPECT_EQ(0, _acmA->SetCodecFEC(false));
   EXPECT_FALSE(_acmA->CodecFEC());
+
+#endif  // defined(WEBRTC_CODEC_G722)
 }
 
 int32_t TestRedFec::SetVAD(bool enableDTX, bool enableVAD, ACMVADMode vadMode) {