Added 'doap' files on git.gnome.org for Gtk-Perl projects

[Brian Manning <cpan xaoc org>]

Hi,

I just went through all of the Gtk-Perl project Git repos hosted on
git.gnome.org and added *.doap files for projects that didn't have any
before.

The *.doap files are description files for Open Source projects; more
info can be had at [1].

If you find any spelling errors (or any other errors) with the new
files, please let me know.

Thanks,

Brian

[1] https://github.com/edumbill/doap/wiki

Projects that had *.doap files added:
- Gnome2-GConf
- Gnome2-Print
- Gnome2-Wnck
- Gtk2-GLExt
- Gtk2-GladeXML
- Gtk2-Html2
- Gtk2-SourceView