Remove unused "<let-body>" symbol
Remove unused "<let-body>" symbol

The requirement for the symbol has been removed since at least 7d47498.

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