Normalize custom ICE test

Fixes #4872

Author: flip1995

tests/ui/custom_ice_message.rs

@@ -1,6 +1,7 @@
 // rustc-env:RUST_BACKTRACE=0
 // normalize-stderr-test: "Clippy version: .*" -> "Clippy version: foo"
 // normalize-stderr-test: "internal_lints.rs:\d*:\d*" -> "internal_lints.rs"
+// normalize-stderr-test: "', .*clippy_lints" -> "', clippy_lints"
 
 #![deny(clippy::internal)]