vim-patch:8.0.0500: quotestar test is still a bit flaky

Problem:    Quotestar test is still a bit flaky.
Solution:   Add a slower check for v:version.
4889ad7c6c

src/nvim/version.c

@@ -1139,7 +1139,7 @@ static const int included_patches[] = {
   // 503,
   502,
   // 501,
-  // 500,
+  500,
   499,
   498,
   // 497,