patch 8.1.0882: checking for FEAT_MBYTE which doesn't exist anymore

Problem:    Checking for FEAT_MBYTE which doesn't exist anymore. (Christ van
            Willegen)
Solution:   Remove it.
diff --git a/src/version.c b/src/version.c
index 48236fe..164fd44 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    882,
+/**/
     881,
 /**/
     880,