floss: Delete rootcanal Cargo.lock in build.py

        shutil.rmtree(self.output_dir)

        shutil.rmtree(self.output_dir)

        # Remove Cargo.lock that may have become generated

        # Remove Cargo.lock that may have become generated

        cargo_lock_files = [

            os.path.join(self.platform_dir, 'bt', 'Cargo.lock'),

            os.path.join(self.platform_dir, 'bt', 'tools', 'rootcanal', 'Cargo.lock'),

        ]

        for lock_file in cargo_lock_files:

            try:

            try:

            os.remove(os.path.join(self.platform_dir, 'bt', 'Cargo.lock'))

                os.remove(lock_file)

                print('Removed {}'.format(lock_file))

            except FileNotFoundError:

            except FileNotFoundError:

                pass

                pass