Bug#957271: gfpoken: ftbfs with GCC-10

[Reiner Herrmann]

Hi,

the GCC 10 build error is easily fixed with the attached patch.

But the build also fails while generating artwork via a Gimp script
(art/mktiles):

> Starting extension: 'extension-script-fu'
> No batch interpreter specified, using the default 'plug-in-script-fu-eval'.
> Welcome to TinyScheme, Version 1.40
> Copyright (c) Dimitrios Souflis
> 
> ts>

It then just hangs in this tinyscheme "shell".
Unfortunately I don't know enough about Gimp scripting to fix that.

Kind regards,
  Reiner
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