Remove '<(library)' in  gyp files.

This will remove all usage of '<(library)' in all webrtc gyp files. 
Review URL: https://webrtc-codereview.appspot.com/1049005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3392 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/common_audio/signal_processing/signal_processing.gypi b/webrtc/common_audio/signal_processing/signal_processing.gypi
index 91592ea..929569d 100644
--- a/webrtc/common_audio/signal_processing/signal_processing.gypi
+++ b/webrtc/common_audio/signal_processing/signal_processing.gypi
@@ -10,7 +10,7 @@
   'targets': [
     {
       'target_name': 'signal_processing',
-      'type': '<(library)',
+      'type': 'static_library',
       'include_dirs': [
         'include',
       ],
@@ -109,7 +109,7 @@
       'targets': [
         {
           'target_name': 'signal_processing_neon',
-          'type': '<(library)',
+          'type': 'static_library',
           'includes': ['../../build/arm_neon.gypi',],
           'sources': [
             'cross_correlation_neon.S',