patch 8.1.0886: compiler warning for NULL pointer and condition always true

Problem:    Compiler warning for adding to NULL pointer and a condition that
            is always true.
Solution:   Check for NULL pointer before adding. Remove useless "if".
            (Friedirch, closes #3913)
diff --git a/src/version.c b/src/version.c
index 641d802..aa17e0a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    886,
+/**/
     885,
 /**/
     884,