tests: fix broken-pipe-no-ice to use bare_rustc/rustc

Where host compiler runtime libs are properly configured, instead of raw
`RUSTC`/`RUSTDOC` commands.

Co-authored-by: Jesus Checa Hidalgo <jchecahi@redhat.com>

Author: jieyouxu

tests/run-make/broken-pipe-no-ice/rmake.rs

@@ -14,7 +14,7 @@
 use std::io::Read;
 use std::process::{Command, Stdio};
 
-use run_make_support::env_var;
+use run_make_support::{bare_rustc, rustdoc};
 
 #[derive(Debug, PartialEq)]
 enum Binary {
@@ -67,11 +67,13 @@ fn check_broken_pipe_handled_gracefully(bin: Binary, mut cmd: Command) {
 }
 
 fn main() {
-    let mut rustc = Command::new(env_var("RUSTC"));
+    let mut rustc = bare_rustc();
     rustc.arg("--print=sysroot");
+    let rustc = rustc.into_raw_command();
     check_broken_pipe_handled_gracefully(Binary::Rustc, rustc);
 
-    let mut rustdoc = Command::new(env_var("RUSTDOC"));
+    let mut rustdoc = rustdoc();
     rustdoc.arg("--version");
+    let rustdoc = rustdoc.into_raw_command();
     check_broken_pipe_handled_gracefully(Binary::Rustdoc, rustdoc);
 }