patch 8.2.0662: cannot use input() in a channel callback

Problem:    Cannot use input() in a channel callback.
Solution:   Reset vgetc_busy. (closes #6010)
diff --git a/src/version.c b/src/version.c
index 0946468..df2fd1f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    662,
+/**/
     661,
 /**/
     660,