gnu: profanity: Modify build options.

[Tanguy Le Carrour]

Hi Guix!

Yesterday, I submitted a patch to update Profanity [1].

[1]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37903

My motivation was not to get the latest version of the software, but to
get the OMEMO encryption feature! This was only possible with versions > 0.6.

The question is now to know if I can/should modify the package's build
options and dependencies to enable OMEMO? I guess it make sense to have
encryption available by default.

Another thing I would like to do is to enable profanity's "desktop" features,
namely tray icon and notifications. Would it make sense to activate it
by default? Would it be better to create a `profanity-desktop` package
that modify the dependencies and the options?!

What do you think?

-- 
Tanguy