[ekiga] [windows] Fix compile error introduced by my previous commit

[Eugen Dedu <ededu src gnome org>]

commit e91bf761c55f9899d4627eb5e544cb9330c5064d
Author: Eugen Dedu <Eugen Dedu pu-pm univ-fcomte fr>
Date:   Wed Jan 23 16:11:40 2013 +0100

    [windows] Fix compile error introduced by my previous commit

 lib/engine/gui/gtk-frontend/ext-window.cpp |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/lib/engine/gui/gtk-frontend/ext-window.cpp b/lib/engine/gui/gtk-frontend/ext-window.cpp
index 429ffe5..d005a72 100644
--- a/lib/engine/gui/gtk-frontend/ext-window.cpp
+++ b/lib/engine/gui/gtk-frontend/ext-window.cpp
@@ -255,7 +255,9 @@ static void
 ekiga_ext_window_init (EkigaExtWindow *ew)
 {
   ew->priv = new EkigaExtWindowPrivate;
+#ifndef WIN32
   ew->priv->gc = NULL;
+#endif
 }
 
 GtkWidget *