lsh 2.1 (new formula)

New formula for lsh.
But yup, that's the only link:

```
otool -L /usr/local/Cellar/lsh/2.1/bin/* | grep /opt/X11                                    [~]
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
	/opt/X11/lib/libXau.6.dylib (compatibility version 7.0.0, current version 7.0.0)
```