patch 8.2.3950: going beyond the end of the line with /\%V

Problem:    Going beyond the end of the line with /\%V.
Solution:   Check for valid column in getvcol().
diff --git a/src/version.c b/src/version.c
index 9f5ed30..56d900d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3950,
+/**/
     3949,
 /**/
     3948,