[evince] [libview] Fix build with gtk2

[Carlos Garcia Campos <carlosgc src gnome org>]

commit e8ae19eec531a08822c42f7defac4f0bff38d373
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Mon Sep 27 18:02:58 2010 +0200

    [libview] Fix build with gtk2

 libview/ev-loading-window.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libview/ev-loading-window.c b/libview/ev-loading-window.c
index 5ed0c70..a3dd3b3 100644
--- a/libview/ev-loading-window.c
+++ b/libview/ev-loading-window.c
@@ -180,6 +180,8 @@ ev_loading_window_size_allocate (GtkWidget      *widget,
 #if GTK_CHECK_VERSION (2, 90, 8)
         cairo_surface_t *surface;
         cairo_region_t *shape;
+#else
+	GdkPixmap *mask;
 #endif
 	cairo_t         *cr;
 	double           r;