Hello Guile!

Much to my surprise, Guile (v2.2 and 3.0 alike) fail to load a module
that has a dot in its base name.  Directory names with dots
(e.g. ice.10/boot-10.scm => (ice.10 boot-10)) are fine.

The attached patch now makes this work:

--8<---------------cut here---------------start------------->8---
;;; foo.bar.scm
(display "foo.bar\n")
(define-module (foo.bar))
(display "module: foo.bar\n")

16:15:31 janneke@dundal:~/src/guile [env]
$ GUILE=meta/guile ./meta/guild compile foo.bar.scm -o foo.bar.go
wrote `foo.bar.go'
16:15:46 janneke@dundal:~/src/guile [env]
$ ./meta/guile -q -L . -C . -c '(use-modules (foo.bar))'
foo.bar
module: foo.bar
16:16:03 janneke@dundal:~/src/guile [env]
--8<---------------cut here---------------end--------------->8---

The patch applies to 2.2 as 3.0 as well.  The code that I removed has
some comments about what the code is doing, but I fail to grasp any sort
of why.

Greetings,
janneke