Merge branch 'sys-utils' of https://github.com/kerolasa/lelux-utiliteetit

* 'sys-utils' of https://github.com/kerolasa/lelux-utiliteetit: (29 commits)
  docs: add non-return function and if shorthand tips
  build-sys: fixes to USAGE_* macros
  ipcrm: check IPC syscalls
  ipcrm: add --verbose option
  ipcmk: allow high speed ipc creation
  ipcrm: add --all option
  docs: add long options to ipcs.1 man page
  docs: add long options to ipcrm.1 man page
  docs: add long options to ipcmk.1 man page
  docs: add --version to setarch.8
  docs: mention long options in ctrlaltdel.8
  ctrlaltdel: add version & help options
  docs: mention long options in pivot_root.8
  pivot_root: add version & help option
  ipcs: comment & white space clean up
  ipcs: include-what-you-use header check
  ipcs: add long options
  ipcrm: include-what-you-use header check
  ipcrm: refactor new and old main to share code
  ipcrm: exit if unknown error occurs
  ...

diff --cc include/c.h
Simple merge