clean up rmake test

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -23,7 +23,6 @@ run-make/dump-ice-to-disk/Makefile
 run-make/emit-to-stdout/Makefile
 run-make/export-executable-symbols/Makefile
 run-make/extern-diff-internal-name/Makefile
-run-make/extern-flag-disambiguates/Makefile
 run-make/extern-fn-explicit-align/Makefile
 run-make/extern-fn-generic/Makefile
 run-make/extern-fn-mangle/Makefile

tests/run-make/extern-flag-disambiguates/rmake.rs

@@ -1,30 +1,30 @@
 //@ ignore-cross-compile
 
-use run_make_support::{cwd, run, run_in_tmpdir, rustc};
+use run_make_support::{cwd, run, rustc};
 
 // Attempt to build this dependency tree:
 //
-//	A.1   A.2
-//	 |\    |
-//	 | \   |
-//        B  \  C
-//         \ | /
-//          \|/
-//           D
+//    A.1   A.2
+//     |\    |
+//     | \   |
+//     B  \  C
+//      \ | /
+//       \|/
+//        D
 //
 // Note that A.1 and A.2 are crates with the same name.
 
+// original Makefile at https://github.com/rust-lang/rust/commit/cc3c8bbfaf5af19caf3deb131a995a65ca4674f9#diff-23d3f6bcee0c974ae7c793ab6f87c454cffd1f5c9ec17ce86aaf2cf8bc6e5397
+
 fn main() {
-    run_in_tmpdir(|| {
-        rustc().metadata("1").extra_filename("-1").input("a.rs").run();
-        rustc().metadata("2").extra_filename("-2").input("a.rs").run();
-        rustc().input("b.rs").extern_("a", "liba-1.rlib").run();
-        rustc().input("c.rs").extern_("a", "liba-2.rlib").run();
-        println!("before");
-        rustc().cfg("before").input("d.rs").extern_("a", "liba-1.rlib").run();
-        run("d");
-        println!("after");
-        rustc().cfg("after").input("d.rs").extern_("a", "liba-1.rlib").run();
-        run("d");
-    });
+    rustc().metadata("1").extra_filename("-1").input("a.rs").run();
+    rustc().metadata("2").extra_filename("-2").input("a.rs").run();
+    rustc().input("b.rs").extern_("a", "liba-1.rlib").run();
+    rustc().input("c.rs").extern_("a", "liba-2.rlib").run();
+    println!("before");
+    rustc().cfg("before").input("d.rs").extern_("a", "liba-1.rlib").run();
+    run("d");
+    println!("after");
+    rustc().cfg("after").input("d.rs").extern_("a", "liba-1.rlib").run();
+    run("d");
 }