luaPackages.{lrexlib-posix,luasystem}: fix musl build (#484906)

  fetchurl,

  fzf,

  glib,

  glibc,

  gmp,

  gnulib,

  gnum4,

  imagemagick,

  installShellFiles,

  lib,

  libc,

  libevent,

  libiconv,

  libmpack,

  lrexlib-posix = prev.lrexlib-posix.overrideAttrs (old: {

    buildInputs = old.buildInputs ++ [

      glibc.dev

      (lib.getDev libc)

    ];

  });

  luasystem = prev.luasystem.overrideAttrs (

    lib.optionalAttrs stdenv.hostPlatform.isLinux {

      buildInputs = [ glibc.out ];

      buildInputs = [ libc.out ];

    }

  );