a new message with smb_addmsg(), retry (using the configured delay/timeout
values).
On Windows, importing a QWK packet into SMB messagebases stored on a remote
Samba server, for some unknown reason, the read of the msgbase status header
here would fail about 1 out of 100 times, with the error:
 evnt ERROR 13 (Permission denied) (WinError 33) in qwktomsg.cpp line 515
 (sbbs_t::qwk_import_msg) writing "msgbase" access=-203 info=smb_getstatus
 reading status
... as if another task had the msgbase status hdr locked (which, they don't),
and we (this thread) already had it locked (just 8 lines up in this same
function), so shouldn't even be possible. A single retry appeared to be
sufficient, but I went ahead and put the timed-loop with the delay in here.