Readded lua submodule.

sbarex · sbarex · commit 190b03f555cd · 2019-11-12T16:55:10.000+01:00
diff --git a/lua4swift b/lua4swift
@@ -0,0 +1 @@
+Subproject commit 7f4b3a7392017689c8cfd1f98fa89141cb86f7e8
