tls_edit added as a dependency to nacl_irt

Now that build_nexe.py is in charge of applying tls_edit,
nacl_irt needs to depend on tls_edit#host.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3126
TEST= trybots

Review URL: https://codereview.chromium.org/139803011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250291 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250291