[Patch, Fortran, committed] PR61126 – fix wextra_1.f regression

[Tobias Burnus]

Tobias Burnus wrote:
> Committed as Rev. 211766. See PR comments 10, 23 and 24 for the patch 
> and the background. Thanks to Manuel and Dominque for the patch!

And as follow up, I have committed the attached documentation patch. I 
think it is sufficient, even though it does not explicitly state that 
-Wall only works because -Wall implies -Wunused.

Committed as Rev. 211767.

Tobias
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