Merge "-builtin" autodoc bugs workarounds from master into test.

Although some of the bugs (e.g. missing "self") in the autodoc doc strings
when using "-builtin" option were fixed in the Doxygen branch, others are
still present, so we still need to skip some of the tests in "-builtin" case.

Examples/test-suite/python/commentVerifier.py

@@ -1,4 +1,4 @@
-def check(got, expected):
+def check(got, expected, expected_builtin=None):
   if got is None:  # Absence of comment is equivalent to empty comment.
       got = ''