Fixing the latest batch of nasty low level issues.
* Handle different `SIGSYS` event ordering on armhf devices running a newer version of Android. People would have seen this as being stuck at the end of extraction.
* Handle `waitpid` being blocked. Would show up as infinite spinning at the starting service stage on some devices/versions of Android.
* Handle `sendmmsg` being block on some intel/amd devices.
* Handle some devices (Leveno Yogabook, any others?) using a different set of libraries than advertised in `Build.SUPPORTED_ABIS`
* Fix port number issue introduced recently. Was having trouble finding the pid files before.
