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.
--- a/contrib/import-checker.py Thu Mar 31 15:37:21 2016 +0800
+++ b/contrib/import-checker.py Wed Mar 30 21:54:26 2016 +0200
@@ -184,6 +184,8 @@
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.