[Patch] libstdc++/28080, fourth installment

[Paolo Carlini]

Paolo Carlini wrote:

> Oh, yes, thanks for noticing, and, I must add, I didn't know 26.2.6/15 
> was mandating that exact behavior, sigh. To be safe, for now I will 
> punt on the <complex> bits...

Therefore, I'm committing the below: no improvements for now to 
<complex> and additionally a minor one for <iosfwd>, which was including 
unnecessarily <cctype>, delay that to locale_facets.h, just before 
<bits/ctype_base.h>, where it's really used.

Tested x86/x86_64-linux, without PCHs, gnu/generic locale.

Paolo.

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