patch 8.0.1415: warning for unused function without timers feature

Problem:    Warning for unused function without timers feature.
Solution:   Add #ifdef. (John Marriott)

src/gui.c

@@ -2885,6 +2885,7 @@ gui_insert_lines(int row, int count)
     }
 }
 
+#ifdef FEAT_TIMERS
 /*
  * Passed to ui_wait_for_chars_or_timer(), ignoring extra arguments.
  */
@@ -2896,6 +2897,7 @@ gui_wait_for_chars_3(
 {
     return gui_mch_wait_for_chars(wtime);
 }
+#endif
 
 /*
  * Returns OK if a character was found to be available within the given time,

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1415,
 /**/
     1414,
 /**/