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.
diff --git a/src/version.c b/src/version.c
index 8d9a339..c8dde84 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    158,
+/**/
     157,
 /**/
     156,