Ruby

On Solaris 10, the following failure occurs.
(observed in r52648)

 1) Failure: TestSocket#test_udp_recvmsg_truncation [/XXXXX-52648/test/socket/test_socket.rb:709]: <32> expected but was <false>. 

The test code ignores platforms that have no HAVE_STRUCT_MSGHDR_MSG_CONTROL and rflag is always nil.