[PATCH 5/6] Refactor hp-timing rtld usage

[Florian Weimer]

* Wilco Dijkstra:

> The first would declare and initialize the accumulator to zero, while start/stop
> accumulate directly into it without requiring extra temporaries and explicit diff
> and accumulate steps. What do you think?

Can we avoid the preprocessor magic altogether?  What's the value in
that?

Thanks,
Florian