patch 8.0.1072: :highlight command causes a redraw even when nothing changed

Problem:    The :highlight command causes a redraw even when nothing changed.
Solution:   Only set "need_highlight_changed" when an attribute changed.
diff --git a/src/version.c b/src/version.c
index 4d040fb..2ffd91a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1072,
+/**/
     1071,
 /**/
     1070,