Run rustfmt on tests/run-make/.

With the exception of `tests/run-make/translation/test.rs`, which has a
syntax error.

The expected output in `rustdoc-error-lines/rmake.rs`'s required slight
tweaking.

The two `reproducible-build.rs` files need `// ignore-tidy-linelength`
because rustfmt produces lines longer than 100 chars, which tidy doesn't
like, yuk.

rustfmt.toml

@@ -20,7 +20,7 @@ ignore = [
     "/tests/incremental/",
     "/tests/mir-opt/",
     "/tests/pretty/",
-    "/tests/run-make/",
+    "/tests/run-make/translation/test.rs", # Contains syntax errors.
     "/tests/run-make-fulldeps/",
     "/tests/run-pass-valgrind/",
     "/tests/rustdoc/",