wayland-scanner: define meta.pkgConfigModules (#455121)

pkgs/development/libraries/wayland/scanner.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  testers,
   wayland,
   meson,
   pkg-config,
@@ -10,7 +11,7 @@
   libxml2,
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation (finalAttrs: {
   pname = "wayland-scanner";
   inherit (wayland) version src;
 
@@ -41,10 +42,18 @@ stdenv.mkDerivation {
     libxml2
   ];
 
+  passthru = {
+    tests.pkg-config = testers.hasPkgConfigModules {
+      package = finalAttrs.finalPackage;
+      versionCheck = true;
+    };
+  };
+
   meta = with lib; {
     inherit (wayland.meta) homepage license maintainers;
     mainProgram = "wayland-scanner";
     description = "C code generator for Wayland protocol XML files";
     platforms = platforms.unix;
+    pkgConfigModules = [ "wayland-scanner" ];
   };
-}
+})