Merge branch 'fallthrough' of https://github.com/teknoraver/util-linux

* 'fallthrough' of https://github.com/teknoraver/util-linux:
  Use the 'fallthrough' attribute
  move XXH_FALLTHROUGH into a generic include file
  Fix XXH_HAS_C_ATTRIBUTE check

diff --cc misc-utils/findmnt.c
Simple merge

diff --cc sys-utils/ipcrm.c
Simple merge