patch 8.2.3941: SIGTSTP is not handled

Problem:    SIGTSTP is not handled.
Solution:   Handle SIGTSTP like pressing CTRL-Z. (closes #9422)
diff --git a/src/version.c b/src/version.c
index ee3a29f..2a5260a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3941,
+/**/
     3940,
 /**/
     3939,