Sawfish 1.3-3 bug on 64-bit Linux

[Edward Wang <edward edcom com>]

I didn't find this bug in bugzilla, so it may not have been
reported:

I'm running sawfish-1.3-3.x86_64 on an AMD64 with Fedora Core 1.
And it seems that get-x-property returns a CARDINAL value as an
unsigned 64-bit number that has been sign extended from
the original 32-bit value.  The visible result is that
windows with _NET_WM_DESKTOP property of 0xffffffff
gets seen by the lisp code as 0xffffffffffffffff, and
eventually somebody (update-workspace-hints, I think)
calls (make-vector 0x40000000000000000), which generates
the error "#<subr make-vector>, 73786976294838206464, 1".

And the bottom panel (in desktop 0xffffffff) gets a window
frame,

Anyway, I don't have the C source so I'm working around it
by hacking wm-spec.jl.

Both sawfish-1.3-3.x86_64 and sawfish-1.3-2.x86_64 (on the
Pogo Linux Fedora CD) have this bug.