Prepare to use generated shim headers for speex

speex.gyp

 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'use_system_speex%': 0,
   },
   'conditions': [
     ['use_system_speex==0', {
@@ skipping 77 matching lines @@
             ],
           },
           'msvs_disabled_warnings': [4244, 4305],
         },
       ],
     }, { # use_system_speex != 0
       'targets': [
         {
           'target_name': 'libspeex',
           'type': 'none',
+          'variables': {
+            'headers_root_path': 'include',
+            'header_filenames': [
+              'speex/speex_types.h',
+              'speex/speex_callbacks.h',
+              'speex/speex_config_types.h',
+              'speex/speex_stereo.h',
+              'speex/speex_echo.h',
+              'speex/speex_preprocess.h',
+              'speex/speex_jitter.h',
+              'speex/speex.h',
+              'speex/speex_resampler.h',
+              'speex/speex_buffer.h',
+              'speex/speex_header.h',
+              'speex/speex_bits.h',
+            ],
+          },
+          'includes': [
+            '../../build/shim_headers.gypi',
+          ],
           'direct_dependent_settings': {
             'cflags': [
               '<!@(pkg-config --cflags speex)',
             ],
-            'defines': [
-              'USE_SYSTEM_SPEEX',
-            ],
           },
           'link_settings': {
             'ldflags': [
               '<!@(pkg-config --libs-only-L --libs-only-other speex)',
             ],
             'libraries': [
               '<!@(pkg-config --libs-only-l speex)',
             ],
           },
         },
       ],
     }],
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: