WIP: Added support for giflib, updated jpeg and png

gyp/common_variables.gypi

Index: gyp/common_variables.gypi
diff --git a/gyp/common_variables.gypi b/gyp/common_variables.gypi
index 60dcccc1a9ee674e77a7471d31edb0b49ccb4529..03cb63d6ae518d74cf66b5877759bd4475c48296 100644
--- a/gyp/common_variables.gypi
+++ b/gyp/common_variables.gypi
@@ -118,13 +118,6 @@
         ],
       ],
 
-      # skia_giflib_static - on OS variants that normally would link giflib
-      #     with '-lgif' and include the headers from '/usr/include/gif_lib.h',
-      #     don't do that; instead compile and staticlly link the version of
-      #     giflib in third_party/externals/giflib.
-      'skia_giflib_static%': '0',
-
-
       # skia_no_fontconfig - On POSIX systems that would normally use the
       #     SkFontHost_fontconfig interface; use the SkFontHost_linux
       #     version instead.
@@ -206,7 +199,6 @@
     'os_posix%': '<(os_posix)',
 
     'skia_freetype_static%': '<(skia_freetype_static)',
-    'skia_giflib_static%': '<(skia_giflib_static)',
     'skia_no_fontconfig%': '<(skia_no_fontconfig)',
     'skia_sanitizer%': '<(skia_sanitizer)',
     'skia_scalar%': '<(skia_scalar)',