remove tidy line length ignore

Author: Oneirical

tests/run-make/core-no-fp-fmt-parse/rmake.rs

@@ -1,6 +1,5 @@
-// ignore-tidy-linelength
-
-// This test checks that the core library of Rust can be compiled without enabling support for formatting and parsing floating-point numbers.
+// This test checks that the core library of Rust can be compiled without enabling
+// support for formatting and parsing floating-point numbers.
 
 extern crate run_make_support;