Revert "gdm: apply substition to cope with systemd 229 -> 230 upgrade"

This reverts commit 745c379f1b95bfbfef17a5f173180988180e1bb0.

@lethalman will commit a better solution

obadz 1fb49e80 745c379f

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pkgs/desktops/gnome-3/3.18/core/gdm/default.nix
··· 30 30 patches = [ ./xserver_path.patch ./sessions_dir.patch 31 31 ./disable_x_access_control.patch ./no-dbus-launch.patch ]; 32 32 33 - postPatch = '' 34 - substituteInPlace configure --replace 'libsystemd-login >= 186 libsystemd-daemon' 'libsystemd' 35 - substituteInPlace configure --replace 'libsystemd-journal' 'libsystemd' 36 - ''; 37 - 38 33 installFlags = [ "sysconfdir=$(out)/etc" "dbusconfdir=$(out)/etc/dbus-1/system.d" ]; 39 34 40 35 meta = with stdenv.lib; {