fdo#43157 : clean up OSL_POSTCOND

Conflicts:
	include/sal/log-areas.dox

Change-Id: I770b8b9fb82f873ccb88dc26ac05206f703ddf33
Reviewed-on: https://gerrit.libreoffice.org/8805
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>