[libwnck] selector: drop obsolete GTK_CHECK_VERSION

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d204e6b56520be6cd9f60f179c1989ffea85cfc4
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Mar 22 17:23:03 2016 +0200

    selector: drop obsolete GTK_CHECK_VERSION

 libwnck/selector.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/libwnck/selector.c b/libwnck/selector.c
index 4b9e30d..ce356c8 100644
--- a/libwnck/selector.c
+++ b/libwnck/selector.c
@@ -1265,9 +1265,7 @@ wnck_selector_class_init (WnckSelectorClass *klass)
   widget_class->unrealize = wnck_selector_unrealize;
   widget_class->scroll_event = wnck_selector_scroll_event;
 
-#if GTK_CHECK_VERSION (3, 19, 1)
   gtk_widget_class_set_css_name (widget_class, "wnck-selector");
-#endif
 }
 
 static GObject *