Disable NaCl IPC proxy untrusted build on arm.

BUG=116317
TEST=compiles
TBR=bbudge@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10829338

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151695 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/native_client/native_client.gyp

@@ -177,6 +177,10 @@
             '../../native_client/src/shared/gio/gio.gyp:gio_lib',
           ],
         },
+      ],
+    }],
+    ['disable_nacl==0 and disable_nacl_untrusted==0 and target_arch!="arm"', {
+      'targets': [
         {
           'target_name': 'nacl_ipc_irt',
           'type': 'none',