atari: switch off threading for atari tos. i think if we'll ever support MiNT, that should be a separate target, with all the advanced features enabled

git-svn-id: trunk@37877 -

compiler/options.pas

@@ -3157,6 +3157,8 @@ begin
     system_arm_palmos,
     system_m68k_palmos:
       target_unsup_features:=[f_threading];
+    system_m68k_atari:
+      target_unsup_features:=[f_threading];
     else
       target_unsup_features:=[];
   end;