PNaCl: Build a PPAPI shims library for all architectures

ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_irt_shim.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': [
     '../../../../../native_client/build/untrusted.gypi',
   ],
   'targets': [
     {
       'target_name': 'pnacl_irt_shim',
       'type': 'none',
       'variables': {
         'nlib_target': 'pnacl_irt_shim.a',
         'out_newlib64': '<(PRODUCT_DIR)/libpnacl_irt_shim.a',
         'build_glibc': 0,
         'build_newlib': 1,
-        'enable_x86_32': 0,
-        'enable_arm': 0,
         'sources': [
           'pnacl_shim.c',
           'shim_entry.c',
           'shim_ppapi.c',
         ],
         'include_dirs': [
           '../../../..',
         ],
       },
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
       ],
     },
   ],
 }