parsers: alias long to int on Python 3

mercurial/pure/parsers.py

@@ -14,6 +14,9 b' from .node import nullid'
 from . import pycompat
 stringio = pycompat.stringio
 
+if pycompat.ispy3:
+    long = int
+
 _pack = struct.pack
 _unpack = struct.unpack
 _compress = zlib.compress