Merge branch 'master' of https://github.com/bvanassche/fio

Merge branch 'master' of https://github.com/bvanassche/fio

* 'master' of https://github.com/bvanassche/fio:
  Fix a potential deadlock in helper_do_stat()
  t/read-to-pipe-async: Use the monotonic clock when measuring time intervals
  Use CLOCK_MONOTONIC for condition variables used by pthread_cond_timedwait()
  Makefile: Build more test code
  Suppress a Coverity taint warning in check_status_file()
  Micro-optimize __load_ioengine()