nixos/wrappers: make (u)mount have the +s bit.
nixos/wrappers: make (u)mount have the +s bit.

See
https://discourse.nixos.org/t/how-to-make-a-derivations-executables-have-the-s-permission/8555
and:
https://www.linuxquestions.org/questions/slackware-14/must-be-superuser-to-use-mount-fstab-is-correct-however-144932/

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