MIPS optimizations for NS audio processing module

R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/4139006

Patch from Ljubomir Papuga <lpapuga@mips.com>.

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5393 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/audio_processing.gypi b/webrtc/modules/audio_processing/audio_processing.gypi
index 6512f03..1f3f705 100644
--- a/webrtc/modules/audio_processing/audio_processing.gypi
+++ b/webrtc/modules/audio_processing/audio_processing.gypi
@@ -101,6 +101,17 @@
             'ns/nsx_core.h',
             'ns/nsx_defines.h',
           ],
+          'conditions': [
+            ['target_arch=="mipsel"', {
+              'sources': [
+                'ns/nsx_core_mips.c',
+              ],
+            }, {
+              'sources': [
+                'ns/nsx_core_c.c',
+              ],
+            }],
+          ],
         }, {
           'defines': ['WEBRTC_NS_FLOAT'],
           'sources': [