updated for version 7.4.177

Problem:    Compiler warning for unused variable. (Tony Mechelynck)
Solution:   Add #ifdef.

src/move.c

@@ -2101,7 +2101,9 @@ scroll_cursor_halfway(atend)
     int		used;
     lineoff_T	loff;
     lineoff_T	boff;
+#ifdef FEAT_DIFF
     linenr_T	old_topline = curwin->w_topline;
+#endif
 
     loff.lnum = boff.lnum = curwin->w_cursor.lnum;
 #ifdef FEAT_FOLDING

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    177,
 /**/
     176,
 /**/