Improve the relx Windows start script

[essen]

On Windows the script doesn't behave very well, in particular when an error happens, it will still return 0. It should be good to return 1 on failure. Currently the tests for bootstrap-rel will work regardless of the release starting properly, for example. (Note that this test require administrator rights in order to install the release as a service.)

I'm also having trouble with Erlang not able to start distribution for some reasons, but that could very well be just me.

[essen]

Useful link: https://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html

[essen]

There's a bunch of issues I had to disable or try working around in the relx-relup and relx-start-stop tests. https://github.com/ninenines/erlang.mk/blob/master/test/plugin_relx.mk#L157

Would be good to revisit later. In particular, trying to update Relx to the most recent version. But I believe most of these issues remain based on a quick reading of the code of Relx master.