* set.q (show_warranty): Use fputs to print lack-of-warranty

* set.q (show_warranty): Use fputs to print lack-of-warranty
statement, instead of msg.  This is because msg now outputs the
message to output devices, and the output subsystem is not
prepared to deal with table cells that exceed one page in length.
Thanks to John Darrington for bug report and review.  Bug #21093.
(show_copying) Ditto.

* copyleft.c: Add trailing new-lines to lack-of-warranty
statement.