[test] fix threads_io.t on pure redhat/centos
[test] fix threads_io.t on pure redhat/centos

perl Time::HiRes is not installed there on a fresh system.
See http://smolder.parrot.org/app/projects/tap_stream/45422/267
Can't locate Time/HiRes.pm in @INC at t/src/threads_io.t line 10.

FROGGS/parrot,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,tkob/parrot,youprofit/parrot,parrot/parrot,tkob/parrot,parrot/parrot,tkob/parrot,youprofit/parrot,youprofit/parrot,FROGGS/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,parrot/parrot,FROGGS/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,youprofit/parrot