dev-python/south: remove unused patch

Closes: https://github.com/gentoo/gentoo/pull/2375

Signed-off-by: David Seifert <soap@gentoo.org>

dev-python/south/files/south-0.7.5-tests.patch

@@ -1,23 +0,0 @@
-http://south.aeracode.org/ticket/1256
-diff -ur south-0.7.5.orig/south/tests/db.py south-0.7.5/south/tests/db.py
---- south/tests/db.py	2012-05-08 18:37:14.000000000 +0800
-+++ south/tests/db.py	2013-05-18 15:46:23.920225709 +0800
-@@ -1,5 +1,8 @@
--import datetime
--import unittest
-+import datetime, sys
-+if sys.version_info == (2, 7):
-+    import unittest
-+else:
-+    import unittest2 as unittest
- 
- from south.db import db, generic
- from django.db import connection, models
-@@ -71,6 +74,7 @@
-         else:
-             self.fail("Just-deleted table could be selected!")
-     
-+    @unittest.expectedFailure
-     def test_nonexistent_delete(self):
-         """
-         Test deletion of nonexistent tables.