parsers: remove warning: format ‘%ld’ expects argument of type ‘long int’

gcc 4.6.3 on 12.04 Ubuntu machine emits warnings:
mercurial/parsers.c: In function ‘find_deepest’:
mercurial/parsers.c:1288:9: warning: format ‘%ld’ expects argument of type
                    ‘long int’, but argument 3 has type ‘Py_ssize_t’ [-Wformat]
mercurial/parsers.c:1288:9: warning: format ‘%ld’ expects argument of type
                    ‘long int’, but argument 4 has type ‘Py_ssize_t’ [-Wformat]

mercurial/parsers.c

@@ -1285,7 +1285,7 b' static PyObject *find_deepest(indexObjec'
 	if (revcount > capacity) {
 		PyErr_Format(PyExc_OverflowError,
 			     "bitset size (%ld) > capacity (%ld)",
-			     revcount, capacity);
+			     (long)revcount, (long)capacity);
 		return NULL;
 	}