dwarf_errno(3) on FreeBSD
The text b681755a9464, as FreeBSD 12.0-RELEASE, FreeBSD 11.4-RELEASE, FreeBSD 11.3-RELEASE, FreeBSD 11.2-RELEASE, FreeBSD 11.1-RELEASE, FreeBSD 11.0-RELEASE shipped it.
retrieve the error number corresponding to a Dwarf_Error instance