pcb: use xorg.* packages directly instead of xlibsWrapper

As recommended by https://github.com/NixOS/nixpkgs/issues/194054

Built outputs (`x86-linux`) are identical except for the `pcb` binary, which was
manually reviewed with `vbindiff` to confirm that the only differences were
self-$out path references.

pkgs/applications/science/electronics/pcb/default.nix

@@ -8,7 +8,8 @@
 , netpbm
 , imagemagick
 , dbus
-, xlibsWrapper
+, freetype
+, fontconfig
 , libGLU
 , libGL
 , shared-mime-info
@@ -40,7 +41,9 @@ stdenv.mkDerivation rec {
   buildInputs = [
     gtk2
     dbus
-    xlibsWrapper
+    xorg.libXrender
+    freetype
+    fontconfig
     libGLU
     libGL
     tcl