remove matches!-specific code

Author: Jacherr

clippy_lints/src/matches/mod.rs

@@ -23,7 +23,6 @@ mod significant_drop_in_scrutinee;
 mod single_match;
 mod try_err;
 mod wild_in_or_pats;
-mod unnecessary_pattern_matching;
 
 use clippy_config::msrvs::{self, Msrv};
 use clippy_utils::source::{snippet_opt, walk_span_to_context};