[bug-gsrc] Fix sourceinstall, add sourceinstall-gtk, libsrcinst

[Luke Shumaker]

The sourceinstall package currently fails.  It depends on the package
libsrcinst, which is not included.  The sourceinstall-gtk package is
also missing.

The attached patch should properly add support for the sourceinstall
collection of packages.

The patch does not include gpg-keyring files.  I believe the appropriate
gpg key is <https://savannah.gnu.org/people/viewgpg.php?user_id=39435>

I did not list all the dependencies of the packages, such as the GTK
libraries needed for sourceinstall-gtk.

-- 
~ LukeShu
http://lukeshu.ath.cx

sourceinstall.patch
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