patch 8.1.1077: reg_executing() is reset by calling input()

Problem:    reg_executing() is reset by calling input().
Solution:   Implement a more generic way to save and restore reg_executing.
            (Ozaki Kiichi, closes #4192)

src/version.c

@@ -775,6 +775,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1077,
 /**/
     1076,
 /**/