Try to make cython.inline() tests pass in Py3.8 on Windows by adhering to the...

Try to make cython.inline() tests pass in Py3.8 on Windows by adhering to the recommended module loading pattern.

Cython/Build/Inline.py

@@ -37,9 +37,14 @@ if sys.version_info[:2] < (3, 3):
     def load_dynamic(name, module_path):
         return imp.load_dynamic(name, module_path)
 else:
-    from importlib.machinery import ExtensionFileLoader
+    import importlib.util as _importlib_util
     def load_dynamic(name, module_path):
-        return ExtensionFileLoader(name, module_path).load_module()
+        spec = _importlib_util.spec_from_file_location(name, module_path)
+        module = _importlib_util.module_from_spec(spec)
+        # sys.modules[name] = module
+        spec.loader.exec_module(module)
+        return module
+
 
 class UnboundSymbols(EnvTransform, SkipDeclarations):
     def __init__(self):