preloadNSS: warn if unable to open nss backend
preloadNSS: warn if unable to open nss backend

Signed-off-by: Arthur Gautier <f88c5e35ba2b44ad8184caf58e04d88fd477a72f@superbaloo.net>

NixOS/nix,rycee/nix,rycee/nix,NixOS/nix,rycee/nix,rycee/nix,rycee/nix,NixOS/nix,NixOS/nix,NixOS/nix