hardinfo: fix not finding libc

[OPNA2608]

Motivation for this change

On NixOS 18.09 (I don't think master behaves differently), running hardinfo from a terminal and accessing the "Summary" section under "Computer" will show an error in said terminal that accessing /lib/libc.so.6 failed.

This PR fixes this by substituteInPlaceing the affected line with ${stdenv.glibc.out}/lib/libc.so.6 (taken from other packages' solutions). The message goes away, though the report does not appear to have changed…

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There is another error message when accessing the Battery option under Devices, where it will repeatedly print

sh: -c: This option requires an argument.

that I don't know how to fix, but it's more likely to get fixed in this much newer fork, problem being that there hasn't been a release since 0.5.1 in 2009 either because of some minor blockers.

Perhaps we should consider switching to that fork and pinning a recent commit like Ubuntu did instead of waiting for upstream to publish a new version after 10 years of code changes since 0.5.1.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

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