message: fix some spelling errors in cargo_rustc
diff: @@ -435,7 +435,7 @@ impl<'a, 'cfg> Context<'a, 'cfg> {
  // - OSX encodes the dylib name in the executable
  // - Windows rustc multiple files of which we can't easily link all of them
  //
  - // Two expeptions
  + // Two exceptions
  // 1) Upstream dependencies (we aren't exporting + need to resolve name conflict)
  // 2) __CARGO_DEFAULT_LIB_METADATA env var
  //
  