include relx templates in escript

rebar.config

@@ -22,7 +22,9 @@
 {escript_emu_args, "%%! +sbtu +A0\n"}.
 %% escript_incl_extra is for internal rebar-private use only.
 %% Do not use outside rebar. Config interface is not stable.
-{escript_incl_extra, [{"priv/templates/*", "."}, {"rebar/include/*", "."}]}.
+{escript_incl_extra, [{"_build/default/lib/relx/priv/templates/*", "."},
+                      {"priv/templates/*", "."},
+                      {"rebar/include/*", "."}]}.
 
 {erl_opts,
  [{platform_define, "R14", no_callback_support},