regex on panic test

Author: Ellen Arteca

tests/panic/external_C/incorrect_SO_file.rs

@@ -2,6 +2,7 @@
 //@only-linux
 //@only-on-host
 //@compile-flags: -Zmiri-external_c_so_file=tests/external_C/badpath.so
+//@normalize-stderr-test: "note: rustc.*running on.*" -> ""
 
 extern "C" {
     fn printer();

tests/panic/external_C/incorrect_SO_file.stderr

@@ -7,7 +7,7 @@ note: the compiler unexpectedly panicked. this is a bug.
 
 note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
 
-note: rustc 1.64.0-nightly (db4135175 2022-07-16) running on x86_64-unknown-linux-gnu
+
 
 note: compiler flags: -Z ui-testing -Z miri-external_c_so_file=tests/external_C/badpath.so