Commits
Dana Robinson committed 31d180753e5
Added a check for an errno value of ENOSYS after a file lock call
failure. Emits a more helpful error message when occurs.
Applies to the core, family, log, sec2, and stdio VFDs.
The direct VFD has failures in this branch so it was left unchanged
even though it is (technically) supported under SWMR.
Tested on: 64-bit Ubuntu 16.04 LTS (Linux 4.4.0 x86_64) w/ gcc 5.4.0
autotools serial w/ check-vfd