ASSERTs running Java apps on Android

#1912 fixed the crashes, but there are still asserts in debug build which while not immediately fatal should be fixed. This is running the calculator app on Marshmallow.

We have:

1) Uunhandled syscall:

```

```

The unhandled syscall is SYS_rt_sigtimedwait.

2) ASSERT in utils.c:

```
04-03 13:57:24.620 19924 19924 I wrap.sh : owner
04-03 13:57:24.621 19924 19924 I wrap.sh : (Error occurred @45271 frags)
```

3) ASSERT in memcache.c

```