[url] Update vpython spec protobuf.

recipe_modules/url/resources/pycurl.py

 #!/usr/bin/env python
 # Copyright 2017 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 # NOTE: This was imported from Chromium's "tools/build" at revision:
 # 65976b6e2a612439681dc42830e90dbcdf550f40
 
 import argparse
 import json
@@ skipping 127 matching lines @@
 
 ##
 # The following section is read by "vpython" and used to construct the
 # VirtualEnv for this tool.
 #
 # These imports were lifted from "/bootstrap/venv.cfg".
 ##
 # [VPYTHON:BEGIN]
 #
 # wheel: <
-#   name: "infra/python/wheels/cryptography/${platform}_${py_version}_${py_abi}"
+#   name: "infra/python/wheels/cryptography/${platform}_${py_python}_${py_abi}"
 #   version: "version:1.8.1"
 # >
 #
 # wheel: <
 #   name: "infra/python/wheels/appdirs-py2_py3"
 #   version: "version:1.4.3"
 # >
 #
 # wheel: <
 #   name: "infra/python/wheels/asn1crypto-py2_py3"
 #   version: "version:0.22.0"
 # >
 #
 # wheel: <
 #   name: "infra/python/wheels/enum34-py2"
 #   version: "version:1.1.6"
 # >
 #
 # wheel: <
-#   name: "infra/python/wheels/cffi/${platform}_${py_version}_${py_abi}"
+#   name: "infra/python/wheels/cffi/${platform}_${py_python}_${py_abi}"
 #   version: "version:1.10.0"
 # >
 #
 # wheel: <
 #   name: "infra/python/wheels/idna-py2_py3"
 #   version: "version:2.5"
 # >
 #
 # wheel: <
 #   name: "infra/python/wheels/ipaddress-py2"
@@ skipping 35 matching lines @@
 #   version: "version:1.10.0"
 # >
 #
 # wheel: <
 #   name: "infra/python/wheels/requests-py2_py3"
 #   version: "version:2.13.0"
 # >
 #
 # [VPYTHON:END]
 ##