Merge branch 'libuuid/coverity' of https://github.com/t-8ch/util-linux

* 'libuuid/coverity' of https://github.com/t-8ch/util-linux:
  libuuid: construct UUIDv7 without "struct uuid"
  libuuid: construct UUIDv6 without "struct uuid"
  libuuid: add helper to set version and variant in uuid_t