patch 8.2.0479: unloading shared libraries on exit has no purpose

Problem:    Unloading shared libraries on exit has no purpose.
Solution:   Do not unload shared libraries on exit.

src/if_ruby.c

@@ -735,19 +735,6 @@ static struct
     {"", NULL},
 };
 
-/*
- * Free ruby.dll
- */
-    static void
-end_dynamic_ruby(void)
-{
-    if (hinstRuby)
-    {
-	close_dll(hinstRuby);
-	hinstRuby = NULL;
-    }
-}
-
 /*
  * Load library and get all pointers.
  * Parameter 'libname' provides name of DLL.
@@ -797,9 +784,6 @@ ruby_enabled(int verbose)
     void
 ruby_end(void)
 {
-#ifdef DYNAMIC_RUBY
-    end_dynamic_ruby();
-#endif
 }
 
     void