make_test_list.py: Parse the version out of Makefile.envs

This fixes `make_test_list.py` so it can be run with any version of Python as
opposed to having to match the Python version Pyodide uses.

src/tests/make_test_list.py

@@ -4,18 +4,41 @@
 
 import os
 from pathlib import Path
-from sys import version
 from typing import Any
+import subprocess
 
 import ruamel.yaml
 
 yaml = ruamel.yaml.YAML()
 PYODIDE_ROOT = Path(__file__).parents[2]
-LIB_DIR = PYODIDE_ROOT / "cpython/build" f"/Python-{version.split(' ')[0]}" f"/Lib/"
-
 PYTHON_TESTS_YAML = Path(__file__).parent / "python_tests.yaml"
 
 
+def get_makefile_envs():
+    result = subprocess.run(
+        ["make", "-f", str(PYODIDE_ROOT / "Makefile.envs"), ".output_vars"],
+        capture_output=True,
+        text=True,
+        env={"PYODIDE_ROOT": str(PYODIDE_ROOT)},
+    )
+
+    if result.returncode != 0:
+        logger.error("ERROR: Failed to load environment variables from Makefile.envs")
+        exit_with_stdio(result)
+
+    environment = {}
+    for line in result.stdout.splitlines():
+        equalPos = line.find("=")
+        if equalPos != -1:
+            varname = line[0:equalPos]
+
+            value = line[equalPos + 1 :]
+            value = value.strip("'").strip()
+            environment[varname] = value
+
+    return environment
+
+
 def get_old_yaml():
     try:
         with open(PYTHON_TESTS_YAML) as fp:
@@ -69,6 +92,8 @@ def update_tests(doc_group, tests):
 
 if __name__ == "__main__":
     doc = get_old_yaml()
+    version = get_makefile_envs()["PYVERSION"]
+    LIB_DIR = PYODIDE_ROOT / "cpython/build" f"/Python-{version}/Lib/"
     update_tests(doc, collect_tests(LIB_DIR / "test"))
 
     yaml.dump(doc, PYTHON_TESTS_YAML)