Make zathura_set_xid always available

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>

zathura/main.c

@@ -18,10 +18,6 @@
 #include "synctex.h"
 #endif
 
-#ifndef GDK_WINDOWING_X11
-typedef int Window;
-#endif
-
 /* Init locale */
 static void
 init_locale(void)

zathura/zathura.c

@@ -448,7 +448,6 @@ zathura_free(zathura_t* zathura)
   g_free(zathura);
 }
 
-#ifdef GDK_WINDOWING_X11
 void
 zathura_set_xid(zathura_t* zathura, Window xid)
 {
@@ -456,7 +455,6 @@ zathura_set_xid(zathura_t* zathura, Window xid)
 
   zathura->ui.session->gtk.embed = xid;
 }
-#endif
 
 void
 zathura_set_config_dir(zathura_t* zathura, const char* dir)

zathura/zathura.h

@@ -238,15 +238,14 @@ bool zathura_init(zathura_t* zathura);
  */
 void zathura_free(zathura_t* zathura);
 
-#ifdef GDK_WINDOWING_X11
 /**
- * Set parent window id
+ * Set parent window id. This does not have an effect if the underlying Gtk
+ * backend is not X11.
  *
  * @param zathura The zathura session
  * @param xid The window id
  */
 void zathura_set_xid(zathura_t* zathura, Window xid);
-#endif
 
 /**
  * Set the path to the configuration directory