use #pragma once

plugins/archivezip/archive.h

@@ -19,4 +19,6 @@
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#pragma once
+
 Archive* OpenArchive( const char* name );

plugins/archivezip/pkzip.h

@@ -19,8 +19,7 @@
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#if !defined( INCLUDED_PKZIP_H )
-#define INCLUDED_PKZIP_H
+#pragma once
 
 #include "bytestreamutils.h"
 #include "idatastream.h"
@@ -253,5 +252,3 @@ inline SeekableStream::position_type pkzip_find_disk_trailer( SeekableInputStrea
 		return 0;
 	}
 }
-
-#endif

plugins/archivezip/plugin.h

@@ -19,7 +19,4 @@
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#if !defined( INCLUDED_PLUGIN_H )
-#define INCLUDED_PLUGIN_H
-
-#endif
+#pragma once

plugins/archivezip/zlibstream.h

@@ -19,8 +19,7 @@
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#if !defined( INCLUDED_ZLIBSTREAM_H )
-#define INCLUDED_ZLIBSTREAM_H
+#pragma once
 
 #include "zlib.h"
 #include "idatastream.h"
@@ -64,5 +63,3 @@ public:
 		return length - m_zipstream.avail_out;
 	}
 };
-
-#endif