dev-lang/python: Fix test failure due to importing numpy in 3.8+

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-lang/python/files/test-__all__-numpy.patch

@@ -0,0 +1,13 @@
+diff --git a/Lib/test/test___all__.py b/Lib/test/test___all__.py
+index c077881511..0728bef6c4 100644
+--- a/Lib/test/test___all__.py
++++ b/Lib/test/test___all__.py
+@@ -71,6 +71,8 @@ class AllTest(unittest.TestCase):
+         blacklist = set([
+             # Will raise a SyntaxError when compiling the exec statement
+             '__future__',
++            # imports numpy which causes warnings
++            'test.test_pickletools',
+         ])
+ 
+         if not sys.platform.startswith('java'):