windows: add _uuid and _zoneinfo extensions

These were added to the build in cpython 3.9 and need added to our
list of extensions to convert to static.

This required teaching the build system to ignore missing
extensions, as these aren't present on Python <3.9.

Author: indygreg

cpython-windows/build.py

@@ -69,6 +69,8 @@
     },
     "_tkinter": {"ignore_static": True, "shared_depends": ["tcl86t", "tk86t"],},
     "_queue": {},
+    "_uuid": {"ignore_missing": True},
+    "_zoneinfo": {"ignore_missing": True},
     "pyexpat": {},
     "select": {},
     "unicodedata": {},
@@ -1588,7 +1590,16 @@ def collect_python_build_artifacts(
     # Projects that provide extensions.
     extension_projects = set()
 
+    dirs = {p for p in os.listdir(intermediates_path)}
+
     for extension, entry in CONVERT_TO_BUILTIN_EXTENSIONS.items():
+        if extension not in dirs:
+            if entry.get("ignore_missing"):
+                continue
+            else:
+                log("extension not present: %s" % extension)
+                sys.exit(1)
+
         if static and entry.get("ignore_static"):
             continue
 
@@ -1602,8 +1613,6 @@ def collect_python_build_artifacts(
             "sqlite3",
         }
 
-    dirs = {p for p in os.listdir(intermediates_path)}
-
     known_projects = (
         ignore_projects | other_projects | depends_projects | extension_projects
     )