add missing imports for future annotations

mesonbuild/_pathlib.py

@@ -29,6 +29,7 @@
     python bugs are fixed and it is OK to tell our users to "just upgrade
     python".
 '''
+from __future__ import annotations
 
 import pathlib
 import os

mesonbuild/compilers/asm.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import os
 import typing as T
 

mesonbuild/scripts/test_loaded_modules.py

@@ -1,6 +1,9 @@
+from __future__ import annotations
+
 import sys
 import json
 import typing as T
+
 from . import meson_exe
 
 # This script is used by run_unittests.py to verify we don't load too many

mesonbuild/scripts/yasm.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import argparse
 import subprocess
 import typing as T