Restore dummy WITHOUT_{CAPSICUM,CASPER} descriptions

The makeman CI job ensures that all options have description files.

Bring the CI job back to green by adding back WITHOUT_CAPSICUM and
WITHOUT_CASPER description files (that now state the assoicated options
have no effect).

Fixes: c24c117b9644 ("Remove WITHOUT_{CAPSICUM,CASPER} options")
Sponsored by: The FreeBSD Foundation