Unrolled build for rust-lang#115440

Rollup merge of rust-lang#115440 - RalfJung:bootstrap-fmt, r=Mark-Simulacrum

bootstrap/format: remove unnecessary paths.push

Cc rust-lang#106415 (review)
I verified that this still formats all fileds when `get_modified_rs_files` is made to return an error.

r? ``@Nilstrieb``

Author: rust-timer

src/bootstrap/format.rs

@@ -127,8 +127,6 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
         Err(_) => false,
     };
 
-    let mut paths = paths.to_vec();
-
     if git_available {
         let in_working_tree = match build
             .config
@@ -201,8 +199,6 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
                             "WARN: Something went wrong when running git commands:\n{err}\n\
                             Falling back to formatting all files."
                         );
-                        // Something went wrong when getting the version. Just format all the files.
-                        paths.push(".".into());
                     }
                 }
             }