Add wrapper library for the nacl_irt_exception_handling IRT interface

src/untrusted/nacl/nacl.gyp

 # Copyright (c) 2011 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': [
     '../../../build/common.gypi',
   ],
   'variables': {
     'sources_for_standard_interfaces': [
@@ skipping 125 matching lines @@
         'nlib_target': 'libnacl_dyncode_private.a',
         'build_glibc': 0,
         'build_newlib': 1,
       },
       'sources': ['dyncode_private.c'],
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
       ],
     },
     {
+      'target_name': 'nacl_exception_lib',
+      'type': 'none',
+      'variables': {
+        'nlib_target': 'libnacl_exception.a',
+        'nso_target': 'libnacl_exception.so',
+        'build_glibc': 1,
+        'build_newlib': 1,
+        'build_pnacl_newlib': 1,
+      },
+      'sources': ['nacl_exception.c'],
+      'dependencies': [
+        '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
+      ],
+    },
+    {
       'target_name': 'nacl_list_mappings_lib',
       'type': 'none',
       'variables': {
         'nlib_target': 'libnacl_list_mappings.a',
         'nso_target': 'libnacl_list_mappings.so',
         'build_glibc': 1,
         'build_newlib': 1,
       },
       'sources': ['list_mappings.c'],
       'dependencies': [
@@ skipping 22 matching lines @@
         'build_glibc': 1,
         'build_newlib': 1,
       },
       'sources': ['<@(imc_syscalls)'],
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
       ],
     },
   ],
 }