patch 8.1.2398: strptime() test fails on Japanese Mac

Problem:    strptime() test fails on Japanese Mac.
Solution:   Use %T instead of %X.
diff --git a/src/version.c b/src/version.c
index f658039..0cb4bdd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2398,
+/**/
     2397,
 /**/
     2396,