bug#50883: Suckless packages marked as 'x11' instead of 'expat'

[Sarah Morgensen]

Hello Guix,

It seems like some packages in suckless.scm are listed as having an
'x11' license when they are in fact 'expat' (as listed on
directory.fsf.org and confirmed by visual inspection).

I only checked three: dwm, dmenu, and st; but I suspect there are many
more.

(Perhaps at some point we should write a linter to check for potential
license discrepancies?)

--
Sarah