Revert "Dirty workarounds to compile jiffy with Erlang/OTP 23 (#3282)"

This reverts commit 2ca5712507.

rebar.config

@@ -158,9 +158,6 @@
   {if_not_rebar3, {if_version_above, "22", {add, [{port_env, [{"ERL_LDFLAGS", " -L$ERL_EI_LIBDIR -lei"}]}]}}},
   {del, [{erl_opts, [warnings_as_errors]}]}]}.
 
-{post_hooks, [{'get-deps', "cp tools/enc deps/jiffy/"}]}.
-{post_hooks, [{'update-deps', "cp tools/enc deps/jiffy/"}]}.
-
 {post_hook_configure, [{"fast_tls", []},
                        {"stringprep", []},
                        {"fast_yaml", []},