Switch SkJpegCode to libjpeg-turbo

gyp/libjpeg.gyp

 # Copyright 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.
 
 # This is a copy of ../third_party/externals/libjpeg/libjpeg.gyp , modified
 # such that all source paths point into that directory.
 # See http://code.google.com/p/skia/issues/detail?id=543 ('wrap libjpeg.gyp
 # from Chrome's libjpeg port, rather than making our own copy') for a better
 # long-term solution.
 
@@ skipping 82 matching lines @@
                 '../third_party/externals/libjpeg/jpeglibmangler.h',
                 '../third_party/externals/libjpeg/jquant1.c',
                 '../third_party/externals/libjpeg/jquant2.c',
                 '../third_party/externals/libjpeg/jutils.c',
                 '../third_party/externals/libjpeg/jversion.h',
               ],
               'direct_dependent_settings': {
                 'include_dirs': [
                   '../third_party/externals/libjpeg',
                 ],
+                'defines': [
+                  # Mangle the names so they do not conflict with libjpeg-turbo
+                  'NEED_SHORT_EXTERNAL_NAMES',
+                ],
               },
               'cflags': [
                 '-w', # supresses warnings
+                # Mangle the names so they do not conflict with libjpeg-turbo
+                '-DNEED_SHORT_EXTERNAL_NAMES',
               ],
             },
           ],
         }, {  ## use_system_libjpeg != 0
           'targets': [
             {
               'target_name': 'libjpeg',
               'type': 'none',
               'direct_dependent_settings': {
                 'defines': [
                   'USE_SYSTEM_LIBJPEG',
                 ],
               },
               'link_settings': {
                 'libraries': [
                   '-ljpeg',
                 ],
               },
             }
           ],
         }],
       ],
     }],
   ],
 }