Upstream Guix no longer provides ncurses@5 so it's copied over here.
See https://issues.guix.gnu.org/54881.
* nongnu/packages/ncurses.scm: New file.
* nongnu/packages/ncurses.scm (ncurses-5, ncurses/tinfo-5): New
variables.
Signed-off-by: Jonathan Brielmaier <jonathan.brielmaier@web.de>