Fix UTF-7 encoder on Windows

Objects/unicodeobject.c

@@ -4061,7 +4061,7 @@ _PyUnicode_EncodeUTF7(PyObject *str,
 
     start = out = PyBytes_AS_STRING(v);
     for (i = 0; i < len; ++i) {
-        Py_UNICODE ch = PyUnicode_READ(kind, data, i);
+        Py_UCS4 ch = PyUnicode_READ(kind, data, i);
 
         if (inShift) {
             if (ENCODE_DIRECT(ch, !base64SetO, !base64WhiteSpace)) {
@@ -4099,7 +4099,6 @@ _PyUnicode_EncodeUTF7(PyObject *str,
         }
         continue;
 encode_char:
-#ifdef Py_UNICODE_WIDE
         if (ch >= 0x10000) {
             /* code first surrogate */
             base64bits += 16;
@@ -4111,7 +4110,6 @@ encode_char:
             /* prepare second surrogate */
             ch =  0xDC00 | ((ch-0x10000) & 0x3FF);
         }
-#endif
         base64bits += 16;
         base64buffer = (base64buffer << 16) | ch;
         while (base64bits >= 6) {