lsh 2.1 (new formula)

New formula for lsh.
This is what the ``` configure ``` script says:

```
# X11 stuff. We only need Xauth, usually located in libXau.
# FIXME: Use AC_PATH_XTRA instead?
AC_CHECK_HEADERS(X11/Xauth.h)
AC_CHECK_LIB([Xau], [XauGetAuthByAddr])
```