[PATCH v3] tests: fix builtin module test on pypy

[Maciej Fijalkowski]

# HG changeset patch
# User Maciej Fijalkowski <fijall at gmail.com>
# Date 1459367666 -7200
#      Wed Mar 30 21:54:26 2016 +0200
# Node ID 84be092f00583806823976cd1334730d89936223
# Parent  ff0d3b6b287f89594bd8d0308fe2810d2a18ea01
tests: fix builtin module test on pypy

On pypy datetime and cProfile are modules written in Python, not in C.
For the purpose of this test, just list them explicitely as builtins,
which silences warnings about them being imported before stdlib modules.

diff -r ff0d3b6b287f -r 84be092f0058 contrib/import-checker.py
--- a/contrib/import-checker.py	Tue Mar 29 12:29:00 2016 -0500
+++ b/contrib/import-checker.py	Wed Mar 30 21:54:26 2016 +0200
@@ -182,6 +182,8 @@
     yield 'builtins' # python3 only
     for m in 'fcntl', 'grp', 'pwd', 'termios':  # Unix only
         yield m
+    for m in 'cPickle', 'datetime': # in Python (not C) on PyPy
+        yield m
     stdlib_prefixes = set([sys.prefix, sys.exec_prefix])
     # We need to supplement the list of prefixes for the search to work
     # when run from within a virtualenv.