patch 7.4.763
Problem:    Building with Lua 5.1 doesn't work.
Solution:   Define lua_replace and lua_remove. (KF Leong)
diff --git a/src/version.c b/src/version.c
index 9c2d836..f6a5afb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    763,
+/**/
     762,
 /**/
     761,