[PATCH] create a hard dependency on some curses library

[Nils Goroll]

what it really boils down to is Tollef's summary

	well, we require pcre, readline and rst2man to build.. I don't think
	ncurses is excessive.

excerpt from irc:

(18:57:53) slink: Also should we make some curses or the other a hard dependency
in configure? atm building doc/sphinx fails if ! VARNISH_CURSES - because then
there is no varnish(hist|stat|top)_opt2rst
(19:15:40) slink: ok, i have fixed the latter, we just should not try to build
docs for tools we can't build
(19:31:42) fgs: or should we make curses mandatory?
(19:31:55) Mithrandir / thfeen: I wouldn't mind.
(19:32:20) slink: is there a use case for varnish without interactive consoles?
(19:33:59) Kristian: slink: I can see the "I don't really need it"-argument, I
just don't think I think that's worth worrying about.
(19:34:17) Kristian: I don't see why anyone would *need* to run without curses
available.
(19:34:29) Mithrandir / thfeen: well, we require pcre, readline and rst2man to
build.. I don't think ncurses is excessive.
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