patch 8.1.0536: file time test fails when using NFS

Problem:    File time test fails when using NFS.
Solution:   Use three file times instead of localtim(). (James McCoy,
            closes #3618)
diff --git a/src/version.c b/src/version.c
index eaaf98a..c0a5845 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    536,
+/**/
     535,
 /**/
     534,