[polari/wip/fmuellner/lib-cleanup: 2/4] lib: Replace #include guards with #pragma once

[Florian Müllner <fmuellner src gnome org>]

commit aea5074484f04faf9223ba625339bdcbd04db734
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Dec 8 23:18:26 2017 +0100

    lib: Replace #include guards with #pragma once
    
    It's more concise and supported by all compilers we care about ...

 src/lib/polari-drag-helper.h | 5 +----
 src/lib/polari-room.h        | 5 +----
 src/lib/polari-util.h        | 5 +----
 3 files changed, 3 insertions(+), 12 deletions(-)
---
diff --git a/src/lib/polari-drag-helper.h b/src/lib/polari-drag-helper.h
index a456611..87751d3 100644
--- a/src/lib/polari-drag-helper.h
+++ b/src/lib/polari-drag-helper.h
@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
  */
 
-#ifndef __POLARI_DRAG_HELPER_H__
-#define __POLARI_DRAG_HELPER_H__
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -34,5 +33,3 @@ guint    polari_drag_dest_find_target (GtkWidget      *widget,
                                        GdkDragContext *context);
 
 G_END_DECLS
-
-#endif /* __POLARI_DRAG_HELPER_H__ */
diff --git a/src/lib/polari-room.h b/src/lib/polari-room.h
index 0170245..db882b8 100644
--- a/src/lib/polari-room.h
+++ b/src/lib/polari-room.h
@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
  */
 
-#ifndef __POLARI_ROOM_H__
-#define __POLARI_ROOM_H__
+#pragma once
 
 #include <glib-object.h>
 
@@ -52,5 +51,3 @@ char *polari_create_room_id (TpAccount    *account,
                              TpHandleType  type);
 
 G_END_DECLS
-
-#endif /* __POLARI_ROOM_H__ */
diff --git a/src/lib/polari-util.h b/src/lib/polari-util.h
index 0475105..5d0f46b 100644
--- a/src/lib/polari-util.h
+++ b/src/lib/polari-util.h
@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
  */
 
-#ifndef __POLARI_UTIL_H__
-#define __POLARI_UTIL_H__
+#pragma once
 
 #include <glib.h>
 
@@ -27,5 +26,3 @@ gboolean polari_util_match_identify_message (const char  *message,
                                              char       **command,
                                              char       **username,
                                              char       **password);
-
-#endif /* __POLARI_UTIL_H__ */