Remove Python 3.7 branches (#11238)

stdlib/distutils/util.pyi

@@ -1,12 +1,9 @@
-import sys
 from _typeshed import StrPath, Unused
 from collections.abc import Callable, Container, Iterable, Mapping
 from typing import Any
 from typing_extensions import Literal
 
-if sys.version_info >= (3, 8):
-    def get_host_platform() -> str: ...
-
+def get_host_platform() -> str: ...
 def get_platform() -> str: ...
 def convert_path(pathname: str) -> str: ...
 def change_root(new_root: str, pathname: str) -> str: ...