bdiff: fix yet more fallout from xdiff long/int64 conversion (issue5885)

"l" in Py_BuildValue's format string means long, so passing int64_t
instead results in fireworks on 32bit architectures.

Differential Revision: https://phab.mercurial-scm.org/D3538

mercurial/cext/bdiff.c

@@ -261,7 +261,7 b' static int hunk_consumer(int64_t a1, int'
                          void *priv)
 {
 	PyObject *rl = (PyObject *)priv;
-	PyObject *m = Py_BuildValue("llll", a1, a2, b1, b2);
+	PyObject *m = Py_BuildValue("LLLL", a1, a2, b1, b2);
 	if (!m)
 		return -1;
 	if (PyList_Append(rl, m) != 0) {