Update run-make tests to no longer use aux_build

Author: jieyouxu

tests/run-make/CURRENT_RUSTC_VERSION/rmake.rs

@@ -3,10 +3,10 @@
 // Check that the `CURRENT_RUSTC_VERSION` placeholder is correctly replaced by the current
 // `rustc` version and the `since` property in feature stability gating is properly respected.
 
-use run_make_support::{aux_build, rfs, rustc, source_root};
+use run_make_support::{rfs, rustc, source_root};
 
 fn main() {
-    aux_build().input("stable.rs").emit("metadata").run();
+    rustc().crate_type("lib").input("stable.rs").emit("metadata").run();
 
     let output =
         rustc().input("main.rs").emit("metadata").extern_("stable", "libstable.rmeta").run();

tests/run-make/issue-107495-archive-permissions/rmake.rs

@@ -4,15 +4,15 @@ use std::path::Path;
 
 #[cfg(unix)]
 use run_make_support::libc;
-use run_make_support::{aux_build, rfs};
+use run_make_support::{rfs, rustc};
 
 fn main() {
     #[cfg(unix)]
     unsafe {
         libc::umask(0o002);
     }
 
-    aux_build().arg("foo.rs").run();
+    rustc().crate_type("lib").arg("foo.rs").run();
     verify(Path::new("libfoo.rlib"));
 }