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/diff.c b/src/diff.c
index 0e352d8..11952c7 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1702,9 +1702,7 @@
 diff_cmp(char_u *s1, char_u *s2)
 {
     char_u	*p1, *p2;
-#ifdef FEAT_MBYTE
     int		l;
-#endif
 
     if ((diff_flags & (DIFF_ICASE | DIFF_IWHITE)) == 0)
 	return STRCMP(s1, s2);
@@ -1983,10 +1981,8 @@
     int		idx;
     int		off;
     int		added = TRUE;
-#ifdef FEAT_MBYTE
     char_u	*p1, *p2;
     int		l;
-#endif
 
     /* Make a copy of the line, the next ml_get() will invalidate it. */
     line_org = vim_strsave(ml_get_buf(wp->w_buffer, lnum, FALSE));
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,