setup: preserve version part after the "+" on Windows
Code introduced in early 2010 (
fb203201ce30) was dropping that part after "+".
The rational is to preserve version on the format w.x.y.z where each part is a
number. However we have not been using that format for a while (e.g. the rc
suffix) and nobody reported any fire.
So I am assuming that this code serve no purpose and I am dropping it. We can
reintroduce a newer version of it (that would actually achieve its purpose) in
the future if needed.