tcltklib.c: revert RUBY_UNTYPED_DATA_WARNING

* ext/tk/tcltklib.c (RUBY_UNTYPED_DATA_WARNING): Data_Get_Struct
  is not affected.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48694 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/tk/tcltklib.c

@@ -20,11 +20,7 @@
 #endif
 
 #undef RUBY_UNTYPED_DATA_WARNING
-#ifdef HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P
-#define RUBY_UNTYPED_DATA_WARNING 1
-#else
 #define RUBY_UNTYPED_DATA_WARNING 0
-#endif
 
 #ifdef HAVE_RB_THREAD_CHECK_TRAP_PENDING
 static int rb_thread_critical; /* dummy */