Allow _sre.c to compile with Python 2.2
diff --git a/Modules/_sre.c b/Modules/_sre.c
index b50eae3..8203ac8 100644
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -3110,7 +3110,11 @@
     {NULL, NULL}
 };
 
+#if PY_VERSION_HEX < 0x02030000 
+DL_EXPORT(void) init_sre(void)
+#else
 PyMODINIT_FUNC init_sre(void)
+#endif
 {
     PyObject* m;
     PyObject* d;