[Darwin/simulator] I neglected to update the simulator target when I reformed target arguments. Do so. Also, add :clang support.

From: Dustin L. Howett <dustin@howett.net>

git-svn-id: http://svn.howett.net/svn/theos/trunk@600 4410221e-0ddf-4ce3-99c0-2db6c0dbc727