[Development] headersclean configure option

[Tor Arne Vestbø]

Yes please! +1

Tor Arne 

> On 5 May 2020, at 10:58, Lars Knoll <lars.knoll at qt.io> wrote:
> 
> Hi all,
> 
> Just something I keep stumbling over all the time: When you build Qt (at least as a developer-build), headersclean is enabled by default, adding ~40% to my build time locally. I usually try to disable it because of that, but keep forgetting about it.
> 
> Wouldn’t it make more sense to disable the flag by default (speeding up compiles for all our developers and users), but have a CI configuration that has it enabled so we don’t regress?
> 
> Cheers,
> Lars
> 
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