Install headers into a versioned directory

[heirecka]

Allowing to co-install grantlee-0.5 and grantlee-5.

I needs this because I want to have KDE4 and KDE Frameworks 5 things on my system in parallel.

I don't really care about the actual name of the directory. The important point is that it is different from grantlee-0.5. Please feel free to adjust the patch accordingly or tell me your favorite choice and I'll do it.

[dantti]

Ping? I think this is also useful for Qt6

[rdieter]

Fwiw, we're already successfully using this patch in fedora packaging of grantlee(5)

[dantti]

@steveire are you still thinking about this one?

[steveire]

Yes, I'm aiming to get to it soon, but it will probably be a few weeks before I dig into it to understand it.

[rdieter]

Too bad, this didn't make it into the latest 5.1.0 release :(

[rdieter]

ping? Unfortunately, looks like PR needs rebasing

[heirecka]

I can rebase it, but to be honest I'm not entirely sure that this patch is actually wanted, given that I first uploaded it on gitorious and the time that has passed since then.