Merge branch 'PR/fix-strcasecmp' of https://github.com/karelzak/util-linux-work

Merge branch 'PR/fix-strcasecmp' of https://github.com/karelzak/util-linux-work

* 'PR/fix-strcasecmp' of https://github.com/karelzak/util-linux-work:
  treewide: avoid strcasecmp() for ASCII-only strings
  fdisk,partx: avoid strcasecmp() for ASCII-only strings
  libmount: avoid strcasecmp() for ASCII-only strings
  lsblk: avoid strcasecmp() for ASCII-only strings
  libfdisk: avoid strcasecmp() for ASCII-only strings
  libblkid: avoid strcasecmp() for ASCII-only strings
  include/cctype: fix string comparison