patch 8.2.4278: build with Athena GUI fails

Problem:    Build with Athena GUI fails. (Elimar Riesebieter)
Solution:   Add #ifdef.
diff --git a/src/testing.c b/src/testing.c
index 6fcbaa7..448c01c 100644
--- a/src/testing.c
+++ b/src/testing.c
@@ -1331,6 +1331,7 @@
     return TRUE;
 }
 
+#if defined(FIND_REPLACE_DIALOG)
     static int
 test_gui_find_repl(dict_T *args)
 {
@@ -1357,6 +1358,7 @@
 
     return retval;
 }
+#endif
 
     static int
 test_gui_mouse_event(dict_T *args)
@@ -1476,8 +1478,10 @@
     event = tv_get_string(&argvars[0]);
     if (STRCMP(event, "dropfiles") == 0)
 	rettv->vval.v_number = test_gui_drop_files(argvars[1].vval.v_dict);
+#  if defined(FIND_REPLACE_DIALOG)
     else if (STRCMP(event, "findrepl") == 0)
 	rettv->vval.v_number = test_gui_find_repl(argvars[1].vval.v_dict);
+#  endif
     else if (STRCMP(event, "mouse") == 0)
 	rettv->vval.v_number = test_gui_mouse_event(argvars[1].vval.v_dict);
     else if (STRCMP(event, "scrollbar") == 0)