Merge branch 'meson-more-build-options' of https://github.com/jwillikers/util-linux

* 'meson-more-build-options' of https://github.com/jwillikers/util-linux: (21 commits)
  meson: Add build-lsclocks option
  meson: Add build-enosys option
  meson: Define _DARWIN_C_SOURCE on macOS as is done in Autotools
  strutils.h: Include strings.h header for strncasecmp function
  xalloc.h: Include stdio.h header for vasprintf function
  meson: Fix build by default and install behavior for build-pipesz option
  meson: Add build-fadvise option
  meson: Add build-scriptlive option
  meson: Add build-script option
  meson: Require pty for the su and runuser executables
  meson: Add have_pty variable to check if pty is available
  meson: Add build-blockdev option
  meson: Add build-chcpu option
  meson: Use has_type instead of sizeof to detect cpu_set_t type
  meson: Add build-setarch option
  meson: Add build-rtcwake option
  meson: Add build-ldattach option
  meson: Add build-blkdiscard option
  meson: Add build-fsfreeze option
  meson: Add build-blkzone option
  ...