Remove all references to GYP

webrtc/build/arm_neon.gypi

-# Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-# This file sets correct neon flags. Include it if you want to build
-# source with neon intrinsics.
-# To use this, create a gyp target with the following form:
-# {
-#   'target_name': 'my_lib',
-#   'type': 'static_library',
-#   'sources': [
-#     'foo.c',
-#     'bar.cc',
-#   ],
-#   'includes': ['path/to/this/gypi/file'],
-# }
-
-{
-  'cflags!': [
-    '-mfpu=vfpv3-d16',
-  ],
-  'conditions': [
-    # "-mfpu=neon" is not required for arm64 in GCC.
-    ['target_arch!="arm64"', {
-      'cflags': [
-        '-mfpu=neon',
-       ],
-    }],
-    # Disable GCC LTO on NEON targets due to compiler bug.
-    # TODO(fdegans): Enable this. See crbug.com/408997.
-    ['clang==0 and use_lto==1', {
-      'cflags!': [
-        '-flto',
-        '-ffat-lto-objects',
-      ],
-    }],
-  ],
-}