ld: ignore stab symbols
ld: ignore stab symbols

Makes 6l work better on OS X 10.5.

Fixes issue 1352.
Fixes issue 1353.

R=r
CC=golang-dev
http://codereview.appspot.com/3661042
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go