[bug#41226] gnu: Add bombadillo.

[elaexuotee]

Thanks for taking a look, Efraim.

> 'guix lint' didn't catch this, but I'm pretty sure that this is an
> auto-generated tarball and you should use git-fetch to download the
> source instead.

This sounded surprising to me, so I asked about it on the irc channel. For
posterity, here is a summary of that discussion:

I naively would figure that url-fetch on release tarballs is preferable to a
git-fetch on the associated commit, since the tarball likely contains things
like autoconf output etc. 

On the channel, bricewge mentioned that this discussion just recently came up:
https://lists.gnu.org/archive/html/guix-devel/2020-05/msg00224.html. The
consensus seems to be that neither git-fetch nor url-fetch can be recommended
as preferable across the board.

That said, rekado also mentioned that GitHub has non-deterministically
regenerated tars in the past, causing problems, so I did go with git-fetch in
the updated patch.

> Assuming nothing needs this to build another package, you can add
> '#:install-source? #f' to the arguments.

Done.

> You actually don't need to gzip the man-page, it happens automatically
> as part of the build process. Also, I noticed that there's a .desktop
> file and a license file. Both of those can be installed.

This gave me a bit of grief. The source contains a makefile with an install
target that takes care of these files, but for some reason this was giving me
non-determinism problems. Anyway, I just went ahead and installed these "data"
files manually.

> Other than those small things it looks good. Can you send an updated
> patch?

Here you go!

0001-gnu-Add-bombadillo.patch
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