[obvious patch] add missing chmod to when copying headers

[Basile Starynkevitch]

Chris Demetriou wrote:
> odd corner case when making/installing: if sources were checked out
> with umask that denies group or other read (e.g. 077 or 027), most of
> the installed gcc includes would come out group/other-readable but a
> few wouldn't.


Perhaps the same should be done for PLUGIN_HEADERS (if not done yet).

Cheers

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