Add some missing clang bits to the build system.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Work-around clang weirdness by adding a newline.

I really wish this were a joke, but alas...

This gets me a working stage1 compiler on Linux with Clang with no
modifications. Unfortunately it won't get much farther than that for
various other reasons.

Signed-off-by: Austin Seipp <aseipp@pobox.com>