Fix compiletest compilation

Author: bjorn3

test.sh

@@ -165,6 +165,24 @@ function test_rustc() {
     git checkout $(rustc -V | cut -d' ' -f3 | tr -d '(')
     export RUSTFLAGS=
 
+    git apply - <<EOF
+diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs
+index 887d27fd6dca4..2c2239f2b83d1 100644
+--- a/src/tools/compiletest/src/header.rs
++++ b/src/tools/compiletest/src/header.rs
+@@ -806,8 +806,8 @@ pub fn make_test_description<R: Read>(
+     cfg: Option<&str>,
+ ) -> test::TestDesc {
+     let mut ignore = false;
+     #[cfg(not(bootstrap))]
+-    let ignore_message: Option<String> = None;
++    let ignore_message: Option<&str> = None;
+     let mut should_fail = false;
+
+     let rustc_has_profiler_support = env::var_os("RUSTC_PROFILER_SUPPORT").is_some();
+
+EOF
+
     rm config.toml || true
 
     cat > config.toml <<EOF