new slib and guile 1.6.7

[Greg Troxel]

I'm investigating why in NetBSD pkgsrc the update of slib to 3a2
breaks the guile-slib package, failing when it tries to build the
catalog:

cd /usr/pkg/share/guile/slib;  guile -q -s /usr/pkgsrc/devel/guile-slib/files/ge
ncat.scm
ERROR: Unbound variable: with-load-pathname

gencat.scm is provided by the guile-slib package and is really pretty
simple:

; $NetBSD: gencat.scm,v 1.1.1.1 2000/02/23 20:36:47 jlam Exp $

(use-modules (ice-9 slib))
(slib:load "mklibcat")

It seems that guile has (ice-9 slib) and does not use guile.init from
slib.  I think (ice-9 slib) needs to have support for
with-load-pathname for the new slib to work, but I don't really
understand this.