Add test for regression on Python 3 when LANG=C and there is non-ascii in the...

Add test for regression on Python 3 when LANG=C and there is non-ascii in the metadata file before the version. Ref #469.

pkg_resources/tests/test_pkg_resources.py

+# coding: utf-8
+from __future__ import unicode_literals
+
 import sys
 import tempfile
 import os
@@ -144,7 +147,8 @@ class TestDeepVersionLookupDistutils(object):
         Create a foo package installed (distutils-style) to env.paths['lib']
         as version.
         """
-        attrs = dict(name='foo', version=version)
+        ld = "This package has unicode metadata! ❄"
+        attrs = dict(name='foo', version=version, long_description=ld)
         dist = distutils.dist.Distribution(attrs)
         iei_cmd = distutils.command.install_egg_info.install_egg_info(dist)
         iei_cmd.initialize_options()