Deactivated the intelligibility enhancement functionality by default

webrtc/modules/BUILD.gn

Index: webrtc/modules/BUILD.gn
diff --git a/webrtc/modules/BUILD.gn b/webrtc/modules/BUILD.gn
index c04f00c49bb3df6c179410ec902c4e42706bda0f..955ef5ef75fd51a1fcb0a3615c1edc9e1f6cbb1e 100644
--- a/webrtc/modules/BUILD.gn
+++ b/webrtc/modules/BUILD.gn
@@ -199,8 +199,6 @@ if (rtc_include_tests) {
       "audio_processing/beamformer/mock_nonlinear_beamformer.h",
       "audio_processing/beamformer/nonlinear_beamformer_unittest.cc",
       "audio_processing/echo_cancellation_impl_unittest.cc",
-      "audio_processing/intelligibility/intelligibility_enhancer_unittest.cc",
-      "audio_processing/intelligibility/intelligibility_utils_unittest.cc",
       "audio_processing/splitting_filter_unittest.cc",
       "audio_processing/transient/dyadic_decimator_unittest.cc",
       "audio_processing/transient/file_utils.cc",
@@ -348,6 +346,16 @@ if (rtc_include_tests) {
       "video_processing/test/video_processing_unittest.h",
     ]
 
+    if (intelligibility_enhancer) {
+      defines += [ "WEBRTC_INTELLIGIBILITY_ENHANCER=1" ]
+      sources += [
+        "audio_processing/intelligibility/intelligibility_enhancer_unittest.cc",
+        "audio_processing/intelligibility/intelligibility_utils_unittest.cc",
+      ]
+    } else {
+      defines += [ "WEBRTC_INTELLIGIBILITY_ENHANCER=0" ]
+    }
+
     if (rtc_libvpx_build_vp9) {
       sources +=
           [ "video_coding/codecs/vp9/vp9_screenshare_layers_unittest.cc" ]