message: Fix tests for CI environment
  The `panic="unwind"` appears in the output for the CI tests, but not in
  my local tests. I need to investigate the origin of this configuration
  but it causes the CI builds to fail.
diff: @@ -471,6 +471,7 @@ fn rustc_with_print_cfg_single_target() {
  .with_stdout_contains(
  "\
  debug_assertions
  +panic=\"unwind\"
  target_arch=\"x86_64\"
  target_endian=\"little\"
  target_env=\"msvc\"
  @@ -543,6 +544,7 @@ target_vendor=\"unknown\"
  unix
  debug_assertions
  +panic=\"unwind\"
  target_arch=\"x86_64\"
  target_endian=\"little\"
  target_env=\"msvc\"
  @@ -587,6 +589,7 @@ fn rustc_with_print_cfg_rustflags_env_var() {
  .with_stdout_contains(
  "\
  debug_assertions
  +panic=\"unwind\"
  target_arch=\"x86_64\"
  target_endian=\"little\"
  target_env=\"msvc\"
  @@ -640,6 +643,7 @@ rustflags = ["-C", "target-feature=+crt-static"]
  .with_stdout_contains(
  "\
  debug_assertions
  +panic=\"unwind\"
  target_arch=\"x86_64\"
  target_endian=\"little\"
  target_env=\"msvc\"
  