vim-configurable: Disable hardening flag fortify

Fortify hardening detects a probable buffer overflow in vim at runtime. This
has to be fixed upstream.

Debian also disables fortify:

  https://anonscm.debian.org/cgit/pkg-vim/vim.git/tree/debian/rules#n6

pkgs/applications/editors/vim/configurable.nix

@@ -191,6 +191,8 @@ composableDerivation {
 
   dontStrip = 1;
 
+  hardeningDisable = [ "fortify" ];
+
   meta = with stdenv.lib; {
     description = "The most popular clone of the VI editor";
     homepage    = http://www.vim.org;