nano: build info manual (close #13527)

Make nano depend use texinfo, so that the built packages include the
info manual, and put it into a separate output.

pkgs/applications/editors/nano/default.nix

@@ -1,5 +1,6 @@
 { stdenv, fetchurl
 , ncurses
+, texinfo
 , gettext ? null
 , enableNls ? true
 , enableTiny ? false
@@ -16,7 +17,8 @@ stdenv.mkDerivation rec {
     url = "mirror://gnu/nano/${name}.tar.gz";
     sha256 = "1vl9bim56k1b4zwc3icxp46w6pn6gb042j1h4jlz1jklxxpkwcpz";
   };
-  buildInputs = [ ncurses ] ++ optional enableNls gettext;
+  buildInputs = [ ncurses texinfo ] ++ optional enableNls gettext;
+  outputs = [ "out" "info" ];
   configureFlags = ''
     --sysconfdir=/etc
     ${optionalString (!enableNls) "--disable-nls"}