[python] Mark get_test_binary as not being a test

get_test_binary is a helper method, not a test, make sure nosetests
doesn't pick it up as a test.

llvm-svn: 153173

bindings/python/llvm/tests/base.py

@@ -27,3 +27,4 @@ class TestBase(unittest.TestCase):
                     return path
 
         raise Exception('No suitable test binaries available!')
+    get_test_binary.__test__ = False