Remove C++11 calls from intelligibility_utils

webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h

Index: webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
diff --git a/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h b/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
index 9908ac0456f1974f263a42e33a5124f5a3f9c33a..5013ef05d21b2d70d2b028414e0acee199c7c5e2 100644
--- a/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
+++ b/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
@@ -27,12 +27,6 @@ namespace intelligibility {
 // |limit|.
 float UpdateFactor(float target, float current, float limit);
 
-// std::isfinite for complex numbers.
-bool cplxfinite(std::complex<float> c);
-
-// std::isnormal for complex numbers.
-bool cplxnormal(std::complex<float> c);
-
 // Apply a small fudge to degenerate complex values. The numbers in the array
 // were chosen randomly, so that even a series of all zeroes has some small
 // variability.