* debug.cc (set_errno): Return value of errno that was set, just like the

* debug.cc (set_errno): Return value of errno that was set, just like the
macro.
(setclexec_pid): Replace old handle with new handle.
* debug.h: Reflect change in arguments for setclexec_pid.
* fhandler.cc (fhandler_base::set_inheritance): Ditto.
(fhandler_base::fork_fixup): Ditto.
* cygerrno.h: Reflect return value change for set_errno.