flock-build:

flock-build:
  set -m wasn't needed with ssh -tt and caused problems, remove
ChangeLog:
  [Bug 1172] 4.2.4p7-RC{3,4} fail to build on linux.
  remove unportable 'set -m' from flock-build script
configure.ac:
  reverse accidental backport from -dev of struct rtattr test in
  configure.ac without corresponding ntp_io.c code for HAVE_RTNETLINK

bk: 49fba68eFkfUWG2a50lgKLSnptYAtA