[TexInfo] Compatibility to glibc 2.34

[Hilmar Preuße <hille42@web.de>]

Dear texinfo maintainers,

In the Debian bug tracker we got a report that TeXinfo 6.8 is 
incompatible to glibc 2.34: https://bugs.debian.org/1003483 .

Please evaluate the patch and consider to apply it to your repository. I 
didn't test it thoroughly, I can just confirm that TeXInfo still works 
on glibc 2.33 with the patch in place.

Thanks,
  Hilmar
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