[libwnck/wip/muktupavels/modernize] pager: avoid warning

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 1a543e716fa4a6b7401d084b2023c55ece83629c
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Apr 26 14:34:35 2017 +0300

    pager: avoid warning

 libwnck/pager.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libwnck/pager.c b/libwnck/pager.c
index d982064..1b8f14f 100644
--- a/libwnck/pager.c
+++ b/libwnck/pager.c
@@ -206,7 +206,7 @@ wnck_pager_init (WnckPager *pager)
 {
   int i;
   static const GtkTargetEntry targets[] = {
-    { "application/x-wnck-window-id", 0, 0}
+    { (gchar *) "application/x-wnck-window-id", 0, 0}
   };
 
   pager->priv = WNCK_PAGER_GET_PRIVATE (pager);