patch 8.1.0214: +autochdir feature not reported by has() or :version

Problem:    +autochdir feature not reported by has() or :version.
Solution:   Add the feature in the list.
diff --git a/src/evalfunc.c b/src/evalfunc.c
index a9f6c5b..23cdeb4 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -6045,6 +6045,9 @@
 	"arabic",
 #endif
 	"autocmd",
+#ifdef FEAT_AUTOCHDIR
+       "autochdir",
+#endif
 #ifdef FEAT_AUTOSERVERNAME
 	"autoservername",
 #endif