Linux: fix compatibility with libwebp-0.3 for use_system_libwebp=1 case.

third_party/libwebp/libwebp.gyp

 # Copyright (c) 2012 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_libwebp%': 0,
   },
   'conditions': [
     ['use_system_libwebp==0', {
@@ skipping 144 matching lines @@
         {
           'target_name': 'libwebp',
           'type': 'none',
           'direct_dependent_settings': {
             'defines': [
               'ENABLE_WEBP',
             ],
           },
           'link_settings': {
             'libraries': [
-              '-lwebp',
+              # Check for presence of webpdemux library, use it if present.
+              '<!(python ../../tools/compile_test/compile_test.py '

[jzern, 2013/04/18 21:47:01]

would this be better written as (DEPTH)/tools ?

[Paweł Hajdan Jr., 2013/04/18 22:08:06]

Done.

+              '--code "int main() { return 0; }" '
+              '--run-linker '
+              '--on-success "-lwebp -lwebpdemux" '
+              '--on-failure "-lwebp" '
+              '-- -lwebpdemux)',
             ],
           },
         }
       ],
     }],
   ],
 }