Prevent collisions during static analysis when multiple versions of
erlang are installed

Index: lib/dialyzer/src/dialyzer_plt.erl
--- lib/dialyzer/src/dialyzer_plt.erl.orig
+++ lib/dialyzer/src/dialyzer_plt.erl
@@ -238,7 +238,7 @@ get_default_plt() ->
   case os:getenv("DIALYZER_PLT") of
     false ->
       CacheDir = filename:basedir(user_cache, "erlang"),
-      filename:join(CacheDir, ".dialyzer_plt");
+      filename:join(CacheDir, ".dialyzer${MAJ_V}_plt");
     UserSpecPlt -> UserSpecPlt
   end.
 
