test: relax panic output assertion

rust-lang/rust#122565 adds a new line to thread panic output.
To make the current test suites works on stable, beta, and nightly,
similar to rust-lang#14602,
this relaxes the assertion around that by globbing everything.

tests/build-std/main.rs

@@ -376,6 +376,7 @@ fn remap_path_scope() {
             str![[r#"
 [FINISHED] `release` profile [optimized + debuginfo] target(s) in [ELAPSED]s
 [RUNNING] `target/[HOST_TARGET]/release/foo`
+...
 [..]thread '[..]' panicked at [..]src/main.rs:3:[..]:
 [..]remap to /rustc/<hash>[..]
 [..]at /rustc/[..]/library/std/src/[..]

tests/testsuite/build_script.rs

@@ -4022,6 +4022,7 @@ Caused by:
   cargo::warning=bar
 
   --- stderr
+...
   thread 'main' panicked at build.rs:5:21:
   explicit panic
   [NOTE] run with `RUST_BACKTRACE=1` environment variable to display a backtrace
@@ -4093,6 +4094,7 @@ Caused by:
   cargo::warning=bar
 
   --- stderr
+...
   thread 'main' panicked at [ROOT]/home/.cargo/registry/src/-[HASH]/published-0.1.0/build.rs:5:21:
   explicit panic
   [NOTE] run with `RUST_BACKTRACE=1` environment variable to display a backtrace