Auto merge of #6083 - mikerite:dev-fmt-20200925, r=<try>

Remove rustfmt bug workaround

rust-lang/rustfmt#1873 was fixed earlier this year.

changelog: none

clippy_dev/src/fmt.rs

@@ -47,11 +47,7 @@ pub fn run(check: bool, verbose: bool) {
             let entry = entry?;
             let path = entry.path();
 
-            if path.extension() != Some("rs".as_ref())
-                || entry.file_name() == "ice-3891.rs"
-                // Avoid rustfmt bug rust-lang/rustfmt#1873
-                || cfg!(windows) && entry.file_name() == "implicit_hasher.rs"
-            {
+            if path.extension() != Some("rs".as_ref()) || entry.file_name() == "ice-3891.rs" {
                 continue;
             }