Merge branch '2020wk47' of https://github.com/kerolasa/util-linux

Merge branch '2020wk47' of https://github.com/kerolasa/util-linux

* '2020wk47' of https://github.com/kerolasa/util-linux:
  build-sys: sort various lists in configure.ac
  mkswap: tell how to fix insecure permissions and owner in warning
  lsipc: make default output byte sizes to be in human units
  man: add missing backslash to caret printing macro
  lscpu: fix variable shadowing
  uuidgen: give hint in usage() what uuid namepaces can be used
  uuidgen: use errx() rather than fprintf() when priting errors
  libuuid: simplify uuid_is_null() check
  uuidparse: use uuid type definitions from libuuid header
  uuidparse: use libuuid function to test nil uuid