Fix broken include path for directwrite backend

gyp/ports.gyp

 # Port-specific Skia library code.
 {
   'targets': [
     {
       'target_name': 'ports',
       'product_name': 'skia_ports',
       'type': 'static_library',
       'standalone_static_library': 1,
+      'dependencies': [
+        'utils.gyp:utils',

[borenet, 2013/06/03 14:13:49]

Does this give us '../src/utils' as an include dir?  I think we want to avoid
having dependencies between the libraries which make up skia_lib and prefer just
including the "private" directory.

+      ],
       'include_dirs': [
         '../include/config',
         '../include/core',
         '../include/effects',
         '../include/images',
         '../include/ports',
-        '../include/utils',
         '../include/xml',
         '../src/core',
         '../src/lazy',
         '../src/sfnt',
         '../src/utils',
       ],
       'sources': [
         '../src/ports/SkDebug_nacl.cpp',
         '../src/ports/SkDebug_stdio.cpp',
         '../src/ports/SkDebug_win.cpp',
@@ skipping 161 matching lines @@
       },
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: