cons.saver setgid paranoia: Fail if !HAVE_STRUCT_STAT_ST_RDEV

[egmontkob]

Is there an existing issue for this?

• I have searched the existing issues

Midnight Commander version and build configuration

4.8.33, git

Operating system

Linux

Is this issue reproducible using the latest version of Midnight Commander?

• I confirm the issue is still reproducible with the latest version of Midnight Commander

How to reproduce

In setgid cons.saver, if ! HAVE_STRUCT_STAT_ST_RDEV then we blindly assume minor number 1 with a "FIXME" in the source.

This code is Linux-specific, and Linux does have st_rdev.

In the unlikely case that it's not available, let's fail (either buildtime or runtime) instead of making faulty assumptions.

Expected behavior

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Actual behavior

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Additional context

No response