Extensions relating to OpenBSD-specific functionality

~~~
:io:openbsd (:...n-)
  ;
'For_use_on_OpenBSD_only:_invoke_host_specific_functionality.
add-description

:openbsd:pledge (:s-) ;
'For_use_on_OpenBSD_only:_invoke_pledge()_with_the_provided_string.
add-description

:openbsd:unveil (:s-) ;
'For_use_on_OpenBSD_only:_invoke_unveil()_with_the_provided_string._A_pointer_to_0_can_also_be_passed.
add-description
~~~