Moved the aec_rdft*.c files to be built using C++

webrtc/modules/audio_processing/audio_processing.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
@@ skipping 17 matching lines @@
         '<(webrtc_root)/base/base.gyp:rtc_base_approved',
         '<(webrtc_root)/common.gyp:webrtc_common',
         '<(webrtc_root)/common_audio/common_audio.gyp:common_audio',
         '<(webrtc_root)/modules/modules.gyp:isac',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
       ],
       'sources': [
         'aec/aec_core.cc',
         'aec/aec_core.h',
         'aec/aec_core_internal.h',
-        'aec/aec_rdft.c',
+        'aec/aec_rdft.cc',
         'aec/aec_rdft.h',
         'aec/aec_resampler.cc',
         'aec/aec_resampler.h',
         'aec/echo_cancellation.cc',
         'aec/echo_cancellation_internal.h',
         'aec/echo_cancellation.h',
         'aecm/aecm_core.cc',
         'aecm/aecm_core.h',
         'aecm/echo_control_mobile.cc',
         'aecm/echo_control_mobile.h',
@@ skipping 151 matching lines @@
           'dependencies': ['audio_processing_neon',],
         }],
         ['target_arch=="mipsel" and mips_arch_variant!="r6"', {
           'sources': [
             'aecm/aecm_core_mips.cc',
           ],
           'conditions': [
             ['mips_float_abi=="hard"', {
               'sources': [
                 'aec/aec_core_mips.cc',
-                'aec/aec_rdft_mips.c',
+                'aec/aec_rdft_mips.cc',
               ],
             }],
           ],
         }, {
           'sources': [
             'aecm/aecm_core_c.cc',
           ],
         }],
       ],
       # TODO(jschuh): Bug 1348: fix size_t to int truncations.
@@ skipping 18 matching lines @@
         },
       ],
     }],
     ['target_arch=="ia32" or target_arch=="x64"', {
       'targets': [
         {
           'target_name': 'audio_processing_sse2',
           'type': 'static_library',
           'sources': [
             'aec/aec_core_sse2.cc',
-            'aec/aec_rdft_sse2.c',
+            'aec/aec_rdft_sse2.cc',
           ],
           'conditions': [
             ['os_posix==1', {
               'cflags': [ '-msse2', ],
               'xcode_settings': {
                 'OTHER_CFLAGS': [ '-msse2', ],
               },
             }],
           ],
         },
       ],
     }],
     ['build_with_neon==1', {
       'targets': [{
         'target_name': 'audio_processing_neon',
         'type': 'static_library',
         'includes': ['../../build/arm_neon.gypi',],
         'dependencies': [
           '<(webrtc_root)/common_audio/common_audio.gyp:common_audio',
         ],
         'sources': [
           'aec/aec_core_neon.cc',
-          'aec/aec_rdft_neon.c',
+          'aec/aec_rdft_neon.cc',
           'aecm/aecm_core_neon.cc',
           'ns/nsx_core_neon.c',
         ],
       }],
     }],
   ],
 }