pure: use int instead of long

Similar to the recent 73aa13bc8dac (revlog: use int instead of long,
2017-03-19).

mercurial/pure/parsers.py

@@ -14,8 +14,6 b' from .node import nullid'
 from . import pycompat
 stringio = pycompat.stringio
 
-if pycompat.ispy3:
-    long = int
 
 _pack = struct.pack
 _unpack = struct.unpack
@@ -37,7 +35,7 b' def gettype(q):'
     return int(q & 0xFFFF)
 
 def offset_type(offset, type):
-    return long(long(offset) << 16 | type)
+    return int(int(offset) << 16 | type)
 
 class BaseIndexObject(object):
     def __len__(self):