comms/uhd: unbreak with boost 1.67
host/lib/usrp/cores/rx_vita_core_3000.cpp:77:35: error:
no matching conversion for functional-style cast from 'double' to 'boost::posix_time::milliseconds' (aka
'subsecond_duration<boost::posix_time::time_duration, 1000>')
boost::this_thread::sleep(boost::posix_time::milliseconds(1.0));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~PR: 227427
Reported by: antoine (via exp-run)