Include gif image decoding in images/ on linux.

gyp/images.gyp

 {
   'targets': [
     {
       'target_name': 'images',
       'product_name': 'skia_images',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'libjpeg.gyp:*',
         'libwebp.gyp:libwebp',
@@ skipping 79 matching lines @@
             '../src/images/SkImageDecoder_libgif.cpp',
             '../src/images/SkImageEncoder_Factory.cpp',
             '../src/images/SkMovie_gif.cpp',
           ],
         },{ #else if skia_os != mac
           'sources!': [
             '../src/ports/SkImageDecoder_CG.cpp',
           ],
         }],
         [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "nacl"]', {
-          'sources!': [
-            '../src/images/SkImageDecoder_libgif.cpp',
-            '../src/images/SkMovie_gif.cpp',
-          ],
-          # libpng stuff:
-          # Any targets that depend on this target should link in libpng and
+          # Any targets that depend on this target should link in libpng, libgif, and
           # our code that calls it.
           # See http://code.google.com/p/gyp/wiki/InputFormatReference#Dependent_Settings
           'link_settings': {
             'sources': [
               '../src/images/SkImageDecoder_libpng.cpp',
             ],
             'libraries': [
+              '-lgif',
               '-lpng',
               '-lz',
             ],
           },
-          # end libpng stuff
+          # end libpng/libgif stuff
         }],
         [ 'skia_os == "android"', {
           'include_dirs': [
              '../src/utils',
           ],
           'dependencies': [
              'android_deps.gyp:gif',
              'android_deps.gyp:png',
           ],
         },{ #else if skia_os != android
@@ skipping 16 matching lines @@
       },
     },
   ],
 }
 
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