adding unencoded space character check to guix lint

[Vincent Legoll]

The attached (crude, WIP, RFC) patch allowed to find the following
packages that have unecoded space characters in their URIs:

gnu/packages/games.scm:3668:12: chromium-bsu@0.9.16.1
gnu/packages/games.scm:3920:5: tintin++@2.02.00
gnu/packages/haskell-web.scm:1252:5: ghc-hxt-unicode@9.0.2.4
gnu/packages/libusb.scm:109:5: libusb@0.1.12
gnu/packages/networking.scm:2208:5: asio@1.12.2
gnu/packages/squirrel.scm:34:12: squirrel@3.1
gnu/packages/text-editors.scm:172:5: joe@4.6

Is this worth checking / fixing ?
Is there a reason not to bother about that ?

If this is deemed interesting, I would certainly appreciate help in
polishing the patch...

Thanks

-- 
Vincent Legoll

0001-WIP-RFC-check-package-URIs-don-t-have-unencoded-spac.patch
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