Append os family to arch string

dialyzer_reference

@@ -1,2 +1,2 @@
 
-rebar_utils.erl:158: Call to missing or unexported function escript:foldl/3
+rebar_utils.erl:159: Call to missing or unexported function escript:foldl/3

src/rebar_utils.erl

@@ -71,7 +71,8 @@ is_arch(ArchRegex) ->
 get_arch() ->
     Words = wordsize(),
     erlang:system_info(otp_release) ++ "-"
-        ++ erlang:system_info(system_architecture) ++ "-" ++ Words.
+        ++ erlang:system_info(system_architecture) ++ "-" ++ Words
+        ++ "-" ++ os_family().
 
 wordsize() ->
     try erlang:system_info({wordsize, external}) of
@@ -284,6 +285,10 @@ delayed_halt(Code) ->
 %% Internal functions
 %% ====================================================================
 
+os_family() ->
+    {OsFamily, _} = os:type(),
+    atom_to_list(OsFamily).
+
 get_deprecated_3(Get, Config, OldOpt, NewOpt, Default, When) ->
     case Get(Config, NewOpt, Default) of
         Default ->