Make run-make/allow-non-lint-warnings-cmdline into a ui test

tests/run-make/allow-non-lint-warnings-cmdline/rmake.rs

@@ -1,8 +0,0 @@
-// Test that -A warnings makes the 'empty trait list for derive' warning go away.
-
-use run_make_support::rustc;
-
-fn main() {
-    let output = rustc().input("foo.rs").arg("-Awarnings").run();
-    output.assert_stderr_not_contains("warning");
-}

tests/ui/allow-non-lint-warnings.rs

@@ -1,3 +1,6 @@
+//@ compile-flags: -Awarnings
+//@ check-pass
+
 #[derive()]
 #[derive(Copy, Clone)]
 pub struct Foo;