Update to 2.24.1, add two dependencies for more features (it already
depended on most of the kitchen sink anyway...).

Changes:
* configure.ac, wscript: Version 2.24.1.
* configure.ac: libtool-2.2 compatibility, patch by "Cygwin Ports
maintainer" (bug #564550).

* gnomeapplet/applet.override:
* gnomeapplet/appletmodule.c:
* gnomeapplet/wscript:
Fix build error with missing libgnome/libgnomeui flags.
Patch from Lucas Rocha closes bgo #564525

* tests/common.py: Fix a bug in the import check.

(wiz)