patch 8.2.2675: directory change in a terminal window shell is not followed

Problem:    Directory change in a terminal window shell is not followed.
Solution:   Add the 'autoshelldir' option. (closes #6290)
diff --git a/src/optiondefs.h b/src/optiondefs.h
index dcd195d..42f355c 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -372,6 +372,15 @@
 			    {(char_u *)0L, (char_u *)0L}
 #endif
 			    SCTX_INIT},
+    {"autoshelldir",  "asd",   P_BOOL|P_VI_DEF,
+#ifdef FEAT_AUTOSHELLDIR
+			    (char_u *)&p_asd, PV_NONE,
+			    {(char_u *)FALSE, (char_u *)0L}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)0L, (char_u *)0L}
+#endif
+			    SCTX_INIT},
     {"autoindent",  "ai",   P_BOOL|P_VI_DEF,
 			    (char_u *)&p_ai, PV_AI,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},