patch 8.1.0158: GUI: input() fails if CTRL-C was pressed before

Problem:    GUI: input() fails if CTRL-C was pressed before. (Michael Naumann)
Solution:   call vpeekc() to drop the CTRL-C from the input stream.

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    158,
 /**/
     157,
 /**/