patch 8.1.0305: missing support for Lua 5.4 32 bits on Unix

Problem:    Missing support for Lua 5.4 32 bits on Unix.
Solution:   Define lua_newuserdatauv. (Kazunobu Kuriyama)
diff --git a/src/version.c b/src/version.c
index 8fa17ec..9cb1041 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    305,
+/**/
     304,
 /**/
     303,