rewrite bare-outfile test

Author: Oneirical

tests/run-make/bare-outfile/Makefile

@@ -0,0 +1,15 @@
+// This test checks that manually setting the output file as a bare file with no file extension
+// still results in successful compilation.
+
+//@ ignore-cross-compile
+
+use run_make_support::{run, rustc, tmp_dir};
+use std::fs;
+use std::env;
+
+fn main(){
+    fs::copy("foo.rs", tmp_dir()).unwrap();
+    env::set_current_dir(tmp_dir());
+    rustc().output("foo").input("foo.rs");
+    run("foo");
+}