patch 8.1.2391: cannot build when __QNXNTO__ is defined

Problem:    Cannot build when __QNXNTO__ is defined. (Ian Wayne Larson)
Solution:   Move the check for "qansi". (Ken Takata, closes #5317)
diff --git a/src/version.c b/src/version.c
index 12aaf57..c9d701b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2391,
+/**/
     2390,
 /**/
     2389,