patch 9.0.0527: long sign text may overflow buffer

Problem:    Long sign text may overflow buffer.
Solution:   Use a larger buffer.  Prevent for overflow.

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    527,
 /**/
     526,
 /**/