updated for version 7.3.687

Problem:    Test 16 fails when $DISPLAY is not set.
Solution:   Skip the test when $DISPLAY is not set.

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    687,
 /**/
     686,
 /**/