Remove the fno-rtti excluders now that fno-rtti is only passed to c++ files.

gyp/libwebp.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.
 
 {
   'variables': {
     'use_system_libwebp%': 0,
   },
   'conditions': [
     ['use_system_libwebp==0', {
@@ skipping 10 matching lines @@
             '../third_party/externals/libwebp/dec/frame.c',
             '../third_party/externals/libwebp/dec/idec.c',
             '../third_party/externals/libwebp/dec/io.c',
             '../third_party/externals/libwebp/dec/layer.c',
             '../third_party/externals/libwebp/dec/quant.c',
             '../third_party/externals/libwebp/dec/tree.c',
             '../third_party/externals/libwebp/dec/vp8.c',
             '../third_party/externals/libwebp/dec/vp8l.c',
             '../third_party/externals/libwebp/dec/webp.c',
           ],
-          'cflags!': [
-            '-fno-rtti', # supresses warnings about invalid option of non-C++ code
-          ],
         },
         {
           'target_name': 'libwebp_dsp',
           'type': 'static_library',
           'include_dirs': [
               '../third_party/externals/libwebp',
           ],
           'sources': [
             '../third_party/externals/libwebp/dsp/cpu.c',
             '../third_party/externals/libwebp/dsp/dec.c',
             '../third_party/externals/libwebp/dsp/dec_sse2.c',
             '../third_party/externals/libwebp/dsp/enc.c',
             '../third_party/externals/libwebp/dsp/enc_sse2.c',
             '../third_party/externals/libwebp/dsp/lossless.c',
             '../third_party/externals/libwebp/dsp/upsampling.c',
             '../third_party/externals/libwebp/dsp/upsampling_sse2.c',
             '../third_party/externals/libwebp/dsp/yuv.c',
           ],
-          'cflags!': [
-            '-fno-rtti', # supresses warnings about invalid option of non-C++ code
-          ],
           'conditions': [
             ['skia_os == "android"', {
               'dependencies' : [
                 'android_deps.gyp:cpu_features',
               ],
             }],
           ],
         },
         {
           'target_name': 'libwebp_dsp_neon',
           'conditions': [
             ['armv7 == 1', {
               'type': 'static_library',
               'include_dirs': [
                   '../third_party/externals/libwebp',
               ],
               'sources': [
                 '../third_party/externals/libwebp/dsp/dec_neon.c',
               ],
               # behavior similar dsp_neon.c.neon in an Android.mk
               'cflags!': [
                 '-mfpu=vfpv3-d16',
-                '-fno-rtti', # supresses warnings about invalid option of non-C++ code
               ],
               'cflags': [ '-mfpu=neon' ],
             },{  # "armv7 != 1"
               'type': 'none',
             }],
           ],
         },
         {
           'target_name': 'libwebp_enc',
           'type': 'static_library',
@@ skipping 11 matching lines @@
             '../third_party/externals/libwebp/enc/histogram.c',
             '../third_party/externals/libwebp/enc/iterator.c',
             '../third_party/externals/libwebp/enc/layer.c',
             '../third_party/externals/libwebp/enc/picture.c',
             '../third_party/externals/libwebp/enc/quant.c',
             '../third_party/externals/libwebp/enc/syntax.c',
             '../third_party/externals/libwebp/enc/tree.c',
             '../third_party/externals/libwebp/enc/vp8l.c',
             '../third_party/externals/libwebp/enc/webpenc.c',
           ],
-          'cflags!': [
-            '-fno-rtti', # supresses warnings about invalid option of non-C++ code
-          ],
         },
         {
           'target_name': 'libwebp_utils',
           'type': 'static_library',
           'include_dirs': [
               '../third_party/externals/libwebp',
           ],
           'sources': [
             '../third_party/externals/libwebp/utils/bit_reader.c',
             '../third_party/externals/libwebp/utils/bit_writer.c',
             '../third_party/externals/libwebp/utils/color_cache.c',
             '../third_party/externals/libwebp/utils/filters.c',
             '../third_party/externals/libwebp/utils/huffman.c',
             '../third_party/externals/libwebp/utils/huffman_encode.c',
             '../third_party/externals/libwebp/utils/quant_levels.c',
             '../third_party/externals/libwebp/utils/rescaler.c',
             '../third_party/externals/libwebp/utils/thread.c',
             '../third_party/externals/libwebp/utils/utils.c',
           ],
-          'cflags!': [
-            '-fno-rtti', # supresses warnings about invalid option of non-C++ code
-          ],
         },
         {
           'target_name': 'libwebp',
           'type': 'none',
           'dependencies' : [
             'libwebp_dec',
             'libwebp_dsp',
             'libwebp_dsp_neon',
             'libwebp_enc',
             'libwebp_utils',
@@ skipping 21 matching lines @@
           'link_settings': {
             'libraries': [
               '-lwebp',
             ],
           },
         }
       ],
     }],
   ],
 }