Update x11-wm/hs-xmonad & x11-wm/hs-xmonad-contrib to 0.12

• Removes all patches including XFORK_FIX (it seems it is not needed anymore).
• New port as dependency: devel/hs-setlocale

PR: 213579
Submitted by: Martin Sugioarto <martin@sugioarto.com>
Approved by: maintainer timeout (2 months), rakuco (mentor)
Differential Revision: https://reviews.freebsd.org/D8191