nginx: let modules provide nativeBuildInputs

Some modules run their own build system from their config script and
need build tools in the nginx build.

Assisted-by: Claude:claude-fable-5-1

pkgs/servers/http/nginx/generic.nix

@@ -94,7 +94,8 @@ stdenv.mkDerivation {
     installShellFiles
     removeReferencesTo
   ]
-  ++ nativeBuildInputs;
+  ++ nativeBuildInputs
+  ++ mapModules "nativeBuildInputs";
 
   buildInputs = [
     openssl