dependencies/dev: remove unused imports
flake8 complains about them, and I prefer to have a clean error log in
vim.
import os
import re
-import shutil
from .. import mlog
from .. import mesonlib
-from ..mesonlib import version_compare, Popen_safe, stringlistify, extract_as_list
+from ..mesonlib import version_compare, stringlistify, extract_as_list
from .base import (
DependencyException, ExternalDependency, PkgConfigDependency,
strip_system_libdirs, ConfigToolDependency,
