GYP changes for arm64 linux build

third_party/libwebp/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.
 
 {
   'target_defaults': {
     'conditions': [
       ['os_posix==1 and (target_arch=="arm" or target_arch=="arm64")', {
         'cflags!': [ '-Os' ],
         'cflags': [ '-O2' ],
@@ skipping 163 matching lines @@
             'dsp/lossless_neon.c',
             'dsp/rescaler_neon.c',
             'dsp/upsampling_neon.c',
           ],
           'conditions': [
             ['target_arch == "arm" and arm_version >= 7 and (arm_neon == 1 or arm_neon_optional == 1)', {
               # behavior similar to *.c.neon in an Android.mk
               'cflags!': [ '-mfpu=vfpv3-d16' ],
               'cflags': [ '-mfpu=neon' ],
             }],
-            ['target_arch == "arm64"', {
+            ['target_arch == "arm64" and clang != 1', {
               # avoid an ICE with gcc-4.9: b/15574841
               'cflags': [ '-frename-registers' ],
             }],
           ]
         }, {
           'type': 'none',
         }],
       ],
     },
     {
@@ skipping 66 matching lines @@
       ],
       'direct_dependent_settings': {
         'include_dirs': ['.'],
       },
       'conditions': [
         ['OS!="win"', {'product_name': 'webp'}],
       ],
     },
   ],
 }