* test/rinda/test_rinda.rb (test_make_socket_ipv4_multicast):
  The fifth argument to getsockopt(2) should be modified to
  indicate the actual size of the value on return,
  but not in AIX. This is a know bug. Skip related tests.
* test/rinda/test_rinda.rb (test_ring_server_ipv4_multicast):
  ditto.
* test/rinda/test_rinda.rb (test_make_socket_unicast): ditto.
* test/socket/test_basicsocket.rb (test_getsockopt): ditto.
* test/socket/test_sockopt.rb (test_bool): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54004 b2dd03c8-39d4-4d8f-98ff-823fe69b080e