wayland_1_9: remove

ancient compat version, that no longer has any use

was introduced > 3 yrs ago in https://github.com/NixOS/nixpkgs/commit/0593ad2b1613e22efa88307ee6ee4115563721fb

pkgs/development/libraries/wayland/1.9.nix

@@ -1,33 +0,0 @@
-{ lib, stdenv, fetchurl, pkgconfig
-, libffi, libxml2
-, expat ? null # Build wayland-scanner (currently cannot be disabled as of 1.7.0)
-}:
-
-# Require the optional to be enabled until upstream fixes or removes the configure flag
-assert expat != null;
-
-stdenv.mkDerivation rec {
-  pname = "wayland";
-  version = "1.9.0";
-
-  src = fetchurl {
-    url = "https://wayland.freedesktop.org/releases/${pname}-${version}.tar.xz";
-    sha256 = "1yhy62vkbq8j8c9zaa6yzvn75cd99kfa8n2zfdwl80x019r711ww";
-  };
-
-  configureFlags = [ "--with-scanner" "--disable-documentation" ];
-
-  nativeBuildInputs = [ pkgconfig ];
-
-  buildInputs = [ libffi /* docbook_xsl doxygen graphviz libxslt xmlto */ expat libxml2 ];
-
-  meta = {
-    description = "Reference implementation of the wayland protocol";
-    homepage    = https://wayland.freedesktop.org/;
-    license     = lib.licenses.mit;
-    platforms   = lib.platforms.linux;
-    maintainers = with lib.maintainers; [ codyopel ];
-  };
-
-  passthru.version = version;
-}

pkgs/top-level/all-packages.nix

@@ -14100,8 +14100,6 @@ in
 
   wayland = callPackage ../development/libraries/wayland { };
 
-  wayland_1_9 = callPackage ../development/libraries/wayland/1.9.nix { };
-
   wayland-protocols = callPackage ../development/libraries/wayland/protocols.nix { };
 
   waylandpp = callPackage ../development/libraries/waylandpp { };