Enable limited C API tests on Python 3.15 on Windows

Author: vstinner

tests/setup.py

@@ -16,8 +16,7 @@
 FREE_THREADING = bool(sysconfig.get_config_var('Py_GIL_DISABLED'))
 if sys.implementation.name == 'cpython':
     if FREE_THREADING:
-        # FIXME: test the limited C API on Windows
-        TEST_LIMITED_C_API = (sys.version_info >= (3, 15)) and not MS_WINDOWS
+        TEST_LIMITED_C_API = (sys.version_info >= (3, 15))
     else:
         TEST_LIMITED_C_API = True
 else:

tests/test_pythoncapi_compat_cext.c

@@ -2656,7 +2656,7 @@ module_exec(PyObject *module)
 
 
 // On Python 3.15 and newer, use PySlot API
-#if PY_VERSION_HEX >= 0x030F0000 && !defined(MS_WINDOWS)
+#if PY_VERSION_HEX >= 0x030F0000
 
 PyABIInfo_VAR(abi_info);