Update giflib to 5.1.1 (AOSP hash)

gyp/icu.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     'common_variables.gypi',
   ],
   'variables': {
     'component%': 'static_library',
@@ skipping 45 matching lines @@
             ],
             'copies': [
               {
                 'destination': '<(PRODUCT_DIR)',
                 'files': [ '<(icu_directory)/windows/icudt.dll', ],
               },
             ],
             'msvs_disabled_warnings': [4005, 4068, 4244, 4355, 4996, 4267],
             'msvs_settings': {
               'VCCLCompilerTool': {
-                'RuntimeTypeInfo': 'true',
-                'AdditionalOptions!': [ '/GR-' ],
-                'AdditionalOptions': [ '/EHsc', '/GR', '/w', ],
+                'AdditionalOptions': [ '/EHsc', ],
+              },
+            },
+            'configurations': {
+              'Debug': {
+                'msvs_settings': {
+                  'VCCLCompilerTool': {
+                    'RuntimeTypeInfo': 'true', # /GR
+                  },
+                },
+              },
+              'Release': {
+                'msvs_settings': {
+                  'VCCLCompilerTool': {
+                    'RuntimeTypeInfo': 'true', # /GR
+                  },
+                },
               },
             },
             'all_dependent_settings': {
               'msvs_settings': {
                 'VCLinkerTool': {
                   'AdditionalDependencies': [
                     'advapi32.lib',
                   ],
                 },
               },
@@ skipping 29 matching lines @@
             'xcode_settings': {
               'GCC_ENABLE_CPP_RTTI': 'YES',  # -frtti
               'WARNING_CFLAGS': [ '-w' ],
             },
           }
         ],
       ], # conditions
     },
   ], # targets
 }