Log Message:
Update to 1.23 and fix coredump on NetBSD 4.0 and later.

The changes in version 1.23 are

    * Support for MIPS, x86_64, sparc, alpha, arm, FreeBSD
    * Fix serious sign-extension error in handling IP addresses
    * RTC support can be excluded at compile time
    * Make sources gcc-4 compatible
    * Fix various compiler warnings
    * Handle fluctuations in peer distance better.
    * Fixed handling of stratum zero.
    * Fix various problems for 64-bit systems
    * Flush chronyc output streams after each command, to allow it to be
    driven through pipes
    * Manpage improvements

The changes in version 1.21 are

    * Don't include Linux kernel header files any longer : allows chrony to
      compile on recent distros.
    * Stop trying to use RTC if continuous streams of error messages would
      occur (Linux with HPET).