Add a working SkFontMgr_fontconfig.

gyp/ports.gyp

 # Port-specific Skia library code.
 {
   'targets': [
     {
       'target_name': 'ports',
       'product_name': 'skia_ports',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'core.gyp:*',
@@ skipping 74 matching lines @@
                 '../src/ports/SkFontHost_linux.cpp',
               ],
             }, {
               'link_settings': {
                 'libraries': [
                   '-lfontconfig',
                   '-ldl',
                 ],
               },
               'sources': [
-                '../src/fonts/SkFontMgr_fontconfig.cpp',
+                '../src/ports/SkFontMgr_fontconfig.cpp',
                 '../src/ports/SkFontHost_fontconfig.cpp',
                 '../src/ports/SkFontConfigInterface_direct.cpp',
               ],
             }]
           ],
         }],
         [ 'skia_os == "nacl"', {
           'sources': [
             '../src/ports/SkFontHost_linux.cpp',
           ],
@@ skipping 86 matching lines @@
         }],
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../include/ports',
         ],
       },
     },
   ],
 }