variable.c: public rb_autoload

* variable.c (rb_autoload): restore the visibility for backward
  compatibility.  [ruby-core:84454] [Bug #14236]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61479 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

variable.c

@@ -1882,7 +1882,7 @@ static const rb_data_type_t autoload_data_i_type = {
 #define check_autoload_data(av) \
     (struct autoload_data_i *)rb_check_typeddata((av), &autoload_data_i_type)
 
-void
+RUBY_FUNC_EXPORTED void
 rb_autoload(VALUE mod, ID id, const char *file)
 {
     if (!file || !*file) {