Remove pre-17 namespaced types workaround

rebar.config

@@ -29,8 +29,7 @@
 {escript_incl_extra, [{"relx/priv/templates/*", "_build/default/lib/"},
                       {"rebar/priv/templates/*", "_build/default/lib/"}]}.
 
-{erl_opts, [{platform_define, "^[0-9]+", namespaced_types},
-            {platform_define, "^(19|2)", rand_only},
+{erl_opts, [{platform_define, "^(19|2)", rand_only},
             {platform_define, "^2", unicode_str},
             {platform_define, "^(2[1-9])|(20\\\\.3)", filelib_find_source},
             {platform_define, "^(R|1|20)", fun_stacktrace},

src/rebar.hrl

@@ -55,23 +55,9 @@
                    state :: term(),
                    implementation :: rebar_resource | rebar_resource_v2}).
 
--ifdef(namespaced_types).
 -type rebar_dict() :: dict:dict().
--else.
--type rebar_dict() :: dict().
--endif.
-
--ifdef(namespaced_types).
 -type rebar_digraph() :: digraph:graph().
--else.
--type rebar_digraph() :: digraph().
--endif.
-
--ifdef(namespaced_types).
 -type rebar_set() :: sets:set().
--else.
--type rebar_set() :: set().
--endif.
 
 -ifdef(fun_stacktrace).
 -define(WITH_STACKTRACE(T, R, S), T:R -> S = erlang:get_stacktrace(),).