Bypass Python tests not supported by -builtin

The old static syntax (e.g., dc.new_A() rather than dc.A()) is not
supported with -builtin

Examples/test-suite/python/Makefile.in

@@ -88,7 +88,6 @@ include $(srcdir)/../common.mk
 
 BUILTIN_BROKEN = \
     autodoc.cpptest \
-    default_constructor.cpptest \
     import_nomodule.cpptest \
     python_abstractbase.cpptest \
 

Examples/test-suite/python/default_constructor_runme.py

@@ -1,8 +1,10 @@
+import _default_constructor
+
 # This test is expected to fail with -builtin option.
 # It uses the old static syntax (e.g., dc.new_A() rather than dc.A()),
 # which is not provided with the -builtin option.
-
-import _default_constructor
+if _default_constructor.is_python_builtin():
+  exit(0)
 
 dc = _default_constructor