Update giflib to 5.1.1 (AOSP hash)

src/codec/SkCodec_libgif.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCodec_libgif.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 49 matching lines @@
  */
 static GifFileType* open_gif(SkStream* stream) {
     return DGifOpen(stream, read_bytes_callback, NULL);
 }
 
  /*
  * This function cleans up the gif object after the decode completes
  * It is used in a SkAutoTCallIProc template
  */
 void SkGifCodec::CloseGif(GifFileType* gif) {
-#if GIFLIB_MAJOR < 5 || (GIFLIB_MAJOR == 5 && GIFLIB_MINOR == 0)
-    DGifCloseFile(gif);
-#else
     DGifCloseFile(gif, NULL);
-#endif
 }
 
 /*
  * This function free extension data that has been saved to assist the image
  * decoder
  */
 void SkGifCodec::FreeExtension(SavedImage* image) {
     if (NULL != image->ExtensionBlocks) {
         GifFreeExtensions(&image->ExtensionBlockCount, &image->ExtensionBlocks);
     }
@@ skipping 442 matching lines @@
                 // giflib returns an error code if the record type is not known.
                 // We should catch this error immediately.
                 SkASSERT(false);
                 break;
         }
     } while (TERMINATE_RECORD_TYPE != recordType);
 
     return gif_error("Could not find any images to decode in gif file.\n",
             kInvalidInput);
 }