Log Message:
Update to 1.2.3:

This minor maintenance release adds a -version flag, as well as some
build configuration improvements and janitorial cleanups.

Alan Coopersmith (9):
      Drop usleep fallbacks for ancient OS versions
      Combine usage message strings
      Combine error message strings
      Fix gcc warnings about discarded const qualifiers
      Add printf attribute to usage function and fix warnings it causes
      Fix integer sign/size conversion warnings from clang
      Add -version flag
      Pass buf size to on_or_off instead of just assuming it is big enough
      xset 1.2.3

Jon TURNEY (1):
      Remove unneeded include of windows.h on WIN32