Merge branch 'PHP-7.4'

* PHP-7.4:
  Check ps -p availability in proc_nice test
  Set AI_CANONNAME flag in socket_addrinfo test
  Add ipv6 skipif to test
  Improve privilege check in pcntl_setpriority() test

diff --cc ext/sockets/tests/socket_sendrecvmsg_multi_msg.phpt
Simple merge

diff --cc ext/standard/tests/general_functions/proc_nice_basic.phpt
Simple merge