getgrouplist segfault?

[Andrew V. Samoilov]

Hello,

we can add and use new variable like use_getgrouplist in mc.lib.
Let system admins or users who defined MC_DATADIR approve this
setting for their systems.

I think run-time detection of this glibc misfeature is not trivial.
On other hand it's not right to has two MC for both cases.

-- 
Regards,
Andrew V. Samoilov

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