Allow webrtc compilation with stlport

modules/audio_processing/intelligibility/intelligibility_utils.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 18 matching lines @@
   float delta = fabsf(target - current);
   float sign = copysign(1.0f, target - current);
   return current + sign * fminf(delta, limit);
 }
 
 bool cplxfinite(complex<float> c) {
   return std::isfinite(c.real()) && std::isfinite(c.imag());
 }
 
 bool cplxnormal(complex<float> c) {
-  return std::isnormal(c.real()) && std::isnormal(c.imag());
+  return isnormal(c.real()) && isnormal(c.imag());
 }
 
 complex<float> zerofudge(complex<float> c) {
   const static complex<float> fudge[7] = {{0.001f, 0.002f},
                                           {0.008f, 0.001f},
                                           {0.003f, 0.008f},
                                           {0.0006f, 0.0009f},
                                           {0.001f, 0.004f},
                                           {0.003f, 0.004f},
                                           {0.002f, 0.009f}};
@@ skipping 264 matching lines @@
   for (int i = 0; i < freqs; ++i) {
     target_[i] = 1.0f;
     current_[i] = 1.0f;
   }
 }
 
 void GainApplier::Apply(const complex<float>* in_block,
                         complex<float>* out_block) {
   for (int i = 0; i < freqs_; ++i) {
     float factor = sqrtf(fabsf(current_[i]));
-    if (!std::isnormal(factor)) {
+    if (!isnormal(factor)) {
       factor = 1.0f;
     }
     out_block[i] = factor * in_block[i];
     current_[i] = UpdateFactor(target_[i], current_[i], change_limit_);
   }
 }
 
 }  // namespace intelligibility
 
 }  // namespace webrtc