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

* 'ci/openwrt' of https://github.com/t-8ch/util-linux:
  ci: add OpenWrt SDK based CI jobs
  enosys: provide a nicer build message for syscalls.h generation
  libsmartcols: (samples): fix format truncation warning
  test_uuidd: make pthread_t formatting more robust
  mkfs.minix: handle 64bit time on 32bit system
  enosys: add support for MIPS, PowerPC and ARC
  enosys: include sys/syscall.h