Revert backwards-incompatible const changes.
diff --git a/Modules/bz2module.c b/Modules/bz2module.c
index c8fab7a..ed329b8 100644
--- a/Modules/bz2module.c
+++ b/Modules/bz2module.c
@@ -1275,7 +1275,7 @@
 static int
 BZ2File_init(BZ2FileObject *self, PyObject *args, PyObject *kwargs)
 {
-	static const char *kwlist[] = {"filename", "mode", "buffering",
+	static char *kwlist[] = {"filename", "mode", "buffering",
                                        "compresslevel", 0};
 	PyObject *name;
 	char *mode = "r";
@@ -1664,7 +1664,7 @@
 {
 	int compresslevel = 9;
 	int bzerror;
-	static const char *kwlist[] = {"compresslevel", 0};
+	static char *kwlist[] = {"compresslevel", 0};
 
 	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i:BZ2Compressor",
 					 kwlist, &compresslevel))
@@ -2009,7 +2009,7 @@
 	bz_stream _bzs;
 	bz_stream *bzs = &_bzs;
 	int bzerror;
-	static const char *kwlist[] = {"data", "compresslevel", 0};
+	static char *kwlist[] = {"data", "compresslevel", 0};
 
 	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|i",
 					 kwlist, &data, &datasize,