Unrolled build for rust-lang#132054

Rollup merge of rust-lang#132054 - onur-ozkan:cargo-config, r=Kobzol

do not remove `.cargo` directory

If vendoring isn't used bootstrap removes `.cargo` directory, which prevents developers from setting certain options in the `.cargo/config.toml` file. This was introduced in rust-lang#97513 (specifically in [this commit](rust-lang@345eb14)). Also, since rust-lang#123942, vendoring is now possible even in git sources, which means we shouldn't remove `.cargo` directory in git sources anymore.

src/bootstrap/bootstrap.py

@@ -1092,9 +1092,6 @@ def check_vendored_status(self):
             if not os.path.exists(cargo_dir):
                 eprint('ERROR: vendoring required, but .cargo/config does not exist.')
                 raise Exception("{} not found".format(cargo_dir))
-        else:
-            if os.path.exists(cargo_dir):
-                shutil.rmtree(cargo_dir)
 
 def parse_args(args):
     """Parse the command line arguments that the python script needs."""