updated for version 7.3.1033

Problem:    "\1" .. "\9" are not supported in the new regexp engine.
Solution:   Implement them.  Add a few more tests.

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1033,
 /**/
     1032,
 /**/