xlibsWrapper: remove deprecated and now unused wrapper package

There should be no reason to use this package as it's a remnant of
non-modular X. Chances are you do not want every single library it
used to pull in:

      freetype fontconfig xorg.xorgproto xorg.libX11 xorg.libXt
      xorg.libXft xorg.libXext xorg.libSM xorg.libICE

Just pick the ones you really need instead.

`nixpkgs` does not have any users of `xlibsWrapper`.

Closes: https://github.com/NixOS/nixpkgs/issues/194054

nixos/doc/manual/from_md/release-notes/rl-2305.section.xml

@@ -242,6 +242,14 @@
           that it configures the NixOS boot process, not the Nix daemon.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          Deprecated <literal>xlibsWrapper</literal> transitional
+          package has been removed in favour of direct use of its
+          constitutents: <literal>xorg.libX11</literal>,
+          <literal>freetype</literal> and others.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
   <section xml:id="sec-release-23.05-notable-changes">

nixos/doc/manual/release-notes/rl-2305.section.md

@@ -63,6 +63,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - The `nix.readOnlyStore` option has been renamed to `boot.readOnlyNixStore` to clarify that it configures the NixOS boot process, not the Nix daemon.
 
+- Deprecated `xlibsWrapper` transitional package has been removed in favour of direct use of its constitutents: `xorg.libX11`, `freetype` and others.
+
 ## Other Notable Changes {#sec-release-23.05-notable-changes}
 
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