[nautilus] search-engine-recent: use #pragma once for guarding

[Marco Trevisan <marcotrevi src gnome org>]

commit 6dfb26e3f60f1d688f6ad9ea11a70ec8ee740c5e
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Thu Jul 26 19:00:50 2018 +0200

    search-engine-recent: use #pragma once for guarding

 src/nautilus-search-engine-recent.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/src/nautilus-search-engine-recent.h b/src/nautilus-search-engine-recent.h
index bcd73b97a..a690de430 100644
--- a/src/nautilus-search-engine-recent.h
+++ b/src/nautilus-search-engine-recent.h
@@ -18,8 +18,7 @@
  * Author: Marco Trevisan <marco trevisan canonical com>
  */
 
-#ifndef __NAUTILUS_SEARCH_ENGINE_RECENT_H__
-#define __NAUTILUS_SEARCH_ENGINE_RECENT_H__
+#pragma once
 
 #include <glib-object.h>
 
@@ -32,5 +31,3 @@ G_DECLARE_FINAL_TYPE (NautilusSearchEngineRecent, nautilus_search_engine_recent,
 NautilusSearchEngineRecent *nautilus_search_engine_recent_new (void);
 
 G_END_DECLS
-
-#endif /* __NAUTILUS_SEARCH_ENGINE_RECENT_H__ */