Skip tests that fail with newer versions of Python.

Patch copied from Gentoo:

https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-python/unittest2/files/unittest2-1.1.0-python3.5-test.patch

diff --git a/unittest2/test/test_loader.py b/unittest2/test/test_loader.py
index 683f662..347eea5 100644
--- a/unittest2/test/test_loader.py
+++ b/unittest2/test/test_loader.py
@@ -509,6 +509,7 @@ class Test_TestLoader(unittest2.TestCase):
     #
     # What happens when an impossible name is given, relative to the provided
     # `module`?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromName__relative_malformed_name(self):
         loader = unittest.TestLoader()
 
@@ -811,6 +812,7 @@ class Test_TestLoader(unittest2.TestCase):
     # TestCase or TestSuite instance."
     #
     # What happens when presented with an impossible module name?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromNames__malformed_name(self):
         loader = unittest2.TestLoader()
 
@@ -918,6 +920,7 @@ class Test_TestLoader(unittest2.TestCase):
     # "The method optionally resolves name relative to the given module"
     #
     # What happens when presented with an impossible attribute name?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromNames__relative_malformed_name(self):
         loader = unittest.TestLoader()
 
><td class='form'><form class='right' method='get' action='/guix/log/gnu/system/setuid.scm'>
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<option value='grep'>log msg</option>
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<div class='path'>path: <a href='/guix/log/?id=d2111894c48b2ebd7e7be683c07241bbd8a91919'>root</a>/<a href='/guix/log/gnu?id=d2111894c48b2ebd7e7be683c07241bbd8a91919'>gnu</a>/<a href='/guix/log/gnu/system?id=d2111894c48b2ebd7e7be683c07241bbd8a91919'>system</a>/<a href='/guix/log/gnu/system/setuid.scm?id=d2111894c48b2ebd7e7be683c07241bbd8a91919'>setuid.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/system/setuid.scm?id=d2111894c48b2ebd7e7be683c07241bbd8a91919&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-07-29 13:09:48 -0400'>2021-07-29</span></td><td><a href='/guix/commit/gnu/system/setuid.scm?id=45235e67e4aeac96ad8d60265bef054990aeb425'>system: Add (gnu system setuid).</a><span class='msg-avail'>...<span class='msg-tooltip'>I flubbed and somehow when including the patch series, this got dropped.
Oops... should fix things again.

* gnu/system/setuid.scm: New file.
</span></span></td><td>Christopher Lemmer Webber</td></tr>