code_api|pthreads.ptsig failing on x86 Travis

Created by: toshipiazza

Seen once in https://github.com/DynamoRIO/dynamorio/pull/2906

 93/294 Test  #88: code_api|pthreads.ptsig ..........................................***Failed  Required regular expression not found.Regex=[^Estimation of pi is 3\.142425985001098
$
]  0.64 sec
<ERROR: master_signal_handler with no siginfo (i#26?): tid=19519, sig=10>
Estimation of pi is 3.142425985001098