kmscon: Fix build against systemd 230

From the changelog:

  The compatibility libraries libsystemd-daemon.so,
  libsystemd-journal.so, libsystemd-id128.so, and libsystemd-login.so
  which have been deprecated since systemd-209 have been removed along
  with the corresponding pkg-config files. All symbols provided by those
  libraries are provided by libsystemd.so.

So let's just replace the use of libsystemd-daemon and libsystemd-login
with libsystemd in the configure script until a new version of kmscon
comes along.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/os-specific/linux/kmscon/default.nix

@@ -33,6 +33,11 @@ stdenv.mkDerivation rec {
     libxslt
   ];
 
+  # FIXME: Remove as soon as kmscon > 8 comes along.
+  postPatch = ''
+    sed -i -e 's/libsystemd-daemon libsystemd-login/libsystemd/g' configure
+  '';
+
   configureFlags = [
     "--enable-multi-seat"
     "--disable-debug"