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The leakchecker will report leaked file descriptors when tests do things like access `Etc.getgrgid`, for example, if NSS modules (like `sss`) handle these lookups by connecting to a daemon like `sssd` and leave the connection open. To address this, we can call glibc's `__nss_configure_lookup` to override NSS modules configured in /etc/nsswitch.conf and only use ordinary file/DNS lookups. (This is a cherry-pick of a patch applied to ruby/mspec here: https://github.com/ruby/mspec/pull/62)