The _Stdio testsuite hangs intermittently.
Imported from https://youtrack.roxen.com/issue/PIKE-29
Reported by @grubba
Blocking PIKE-20
Doing tests in modules/_Stdio/testsuite (179 tests, pid 4612)
[WATCHDOG]: 00:40:31: Pike testsuite timeout.
[WATCHDOG]: Current test: Test 96 at /net/myst/export/d1/xenofarm/[pike-8](#8008).1/tron.roxen.com/buildtmp/Pike-v8.1-snapshot/src/modules/_Stdio/testsuite.in:319
[WATCHDOG]: 00:40:31: Sending SIGABRT to 4617.
[WATCHDOG]: 01:21:31: Pike testsuite timeout.
[WATCHDOG]: 01:21:31: Sending SIGABRT to 4573.
*** Signal 6 - core dumped