patch 8.0.1056: cannot build with +diff but without +multi_byte

Problem:    Cannot build with the diff feature but without the mutli-byte
            feature.
Solution:   Remove #ifdefs. (John Marriott)
diff --git a/src/version.c b/src/version.c
index d15565f..652704c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1056,
+/**/
     1055,
 /**/
     1054,