ruby-zoom: init at 4.1.0

From the website,

https://gitlab.com/mjwhitta/zoom

Zoom adds some convenience to ag/ack/grep by allowing you to quickly
open your search results in your editor of choice.

Also available as a ruby gem.

https://rubygems.org/gems/ruby-zoom

In addition to including the ruby-zoom tool, we also added a global
override for the ruby-terminfo gem to handle the ncurses build time
dependency.

pkgs/development/ruby-modules/gem-config/default.nix

@@ -141,6 +141,13 @@ in
     buildInputs = [ imagemagick pkgconfig which ];
   };
 
+  ruby-terminfo = attrs: {
+    buildInputs = [ ncurses ];
+    buildFlags = [
+      "--with-cflags=-I${ncurses.dev}/include"
+      "--with-ldflags=-L${ncurses.out}/lib"
+    ];
+  };
   rugged = attrs: {
     buildInputs = [ cmake pkgconfig openssl libssh2 zlib ];
   };