patch 7.4.1533

Problem:    Using feedkeys() with an empty string disregards 'x' option.
Solution:   Make 'x' work with an empty string. (Thinca)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1533,
 /**/
     1532,
 /**/