fix various Android test suite regressions and add more reflection tests

Most of these regressions were simply due to testing a lot more stuff,
esp. annotations and reflection, revealing holes in the Android
compatibility code.  There are still some holes, but at least the
suite is passing (except for a fragile test in Serialize.java which I
will open an issue for).

Sorry this is such a big commit; there was more to address than I
initially expected.