Log Message:
This package has a _lot_ of options when building it so this is a first
run at enabling most of them.  They are largely untested so feel free to
have a play:

- DBUS support
- glib support
- gdbm support
- gtk support
- python support
- python gtk support
- python DBUS support

None are enabled by default

Other changes include:
- Fix from avahi to work with both old and new versions of DBUS
- Explicily specify sysconfdir as ${PKG_SYSCONFDIR}/avahi