the great onceification (libs)

Replace use of #ifndef header guards with #pragma once

Modern C++, baby!

libs/gtkmm2ext/gtkmm2ext/doi.h

@@ -18,8 +18,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __ardour_gtk_doi_h__
-#define __ardour_gtk_doi_h__
+#pragma once
 
 #ifdef interface
 #undef interface
@@ -41,4 +40,3 @@ template<typename T> /*LIBGTKMM2EXT_API*/ gint delete_on_unmap (GdkEventAny *ign
 	return FALSE;
 }
 
-#endif /* __ardour_gtk_doi_h__ */

libs/gtkmm2ext/gtkmm2ext/gtk_ui.h

@@ -21,8 +21,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __pbd_gtk_ui_h__
-#define __pbd_gtk_ui_h__
+#pragma once
 
 #include <string>
 #include <map>
@@ -206,4 +205,3 @@ private:
 
 } /* namespace */
 
-#endif /* __pbd_gtk_ui_h__ */

libs/gtkmm2ext/gtkmm2ext/gtkutils.h

@@ -16,8 +16,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __gtkutils_h__
-#define __gtkutils_h__
+#pragma once
 
 #include <string>
 
@@ -31,4 +30,3 @@ LIBGTKMM2EXT_API void gtk_set_size_request_to_display_given_text (Gtk::Widget& w
 								  const std::string& text,
 								  gint hpadding = 0,
 								  gint vpadding = 0);
-#endif /* __gtkutils_h__ */

libs/gtkmm2ext/gtkmm2ext/gui_thread.h

@@ -16,8 +16,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __ardour_gtk_gui_thread_h__
-#define __ardour_gtk_gui_thread_h__
+#pragma once
 
 #include <cstdlib>
 #include <gtkmm2ext/gtk_ui.h>
@@ -33,4 +32,3 @@
 
 #define invalidator(x) PBD::EventLoop::__invalidator ((x), __FILE__, __LINE__)
 
-#endif /* __ardour_gtk_gui_thread_h__ */

libs/gtkmm2ext/gtkmm2ext/textviewer.h

@@ -17,8 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __pbd_gtkmm_textviewer_h__
-#define __pbd_gtkmm_textviewer_h__
+#pragma once
 
 #include <string>
 
@@ -59,4 +58,3 @@ class LIBGTKMM2EXT_API TextViewer : public Gtk::Window, public Transmitter
 
 } /* namespace */
 
-#endif  // __pbd_gtkmm_textviewer_h__