bpo-38304: Remove PyConfig.struct_size (GH-16500)

For now, we'll rely on the fact that the config structures aren't covered by the stable ABI.

We may revisit this in the future if we further explore the idea of offering a stable embedding API.
diff --git a/PC/python_uwp.cpp b/PC/python_uwp.cpp
index 2656d18..758c8f7 100644
--- a/PC/python_uwp.cpp
+++ b/PC/python_uwp.cpp
@@ -165,12 +165,8 @@
 wmain(int argc, wchar_t **argv)
 {
     PyStatus status;
-
     PyPreConfig preconfig;
-    preconfig.struct_size = sizeof(PyPreConfig);
-
     PyConfig config;
-    config.struct_size = sizeof(PyConfig);
 
     const wchar_t *moduleName = NULL;
     const wchar_t *p = wcsrchr(argv[0], L'\\');
@@ -189,10 +185,7 @@
         }
     }
 
-    status = PyPreConfig_InitPythonConfig(&preconfig);
-    if (PyStatus_Exception(status)) {
-        goto fail_without_config;
-    }
+    PyPreConfig_InitPythonConfig(&preconfig);
     if (!moduleName) {
         status = Py_PreInitializeFromArgs(&preconfig, argc, argv);
         if (PyStatus_Exception(status)) {