x11: replace its usage by xlibsWrapper directly

Scilab note: the parameters already had pointed to nonexistent dirs
before this set of refactoring. But that config wasn't even used by
default.

pkgs/development/compilers/ocaml/4.00.1.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ncurses, x11 }:
+{ stdenv, fetchurl, ncurses, xlibsWrapper }:
 
 let
    useX11 = !stdenv.isArm && !stdenv.isMips;
@@ -16,9 +16,9 @@ stdenv.mkDerivation rec {
   };
 
   prefixKey = "-prefix ";
-  configureFlags = ["-no-tk"] ++ optionals useX11 [ "-x11lib" x11 ];
+  configureFlags = ["-no-tk"] ++ optionals useX11 [ "-x11lib" xlibsWrapper ];
   buildFlags = "world" + optionalString useNativeCompilers " bootstrap world.opt";
-  buildInputs = [ncurses] ++ optionals useX11 [ x11 ];
+  buildInputs = [ncurses] ++ optionals useX11 [ xlibsWrapper ];
   installTargets = "install" + optionalString useNativeCompilers " installopt";
   preConfigure = ''
     CAT=$(type -tp cat)