Make sure that own header file is included first

Each header corresponding to a .cpp file must be self-contained,
and can be #included without prerequisites.

taglib/mpc/mpcfile.cpp

@@ -23,6 +23,8 @@
  *   http://www.mozilla.org/MPL/                                           *
  ***************************************************************************/
 
+#include "mpcfile.h"
+
 #include "tbytevector.h"
 #include "tstring.h"
 #include "tagunion.h"
@@ -30,7 +32,6 @@
 #include "tpropertymap.h"
 #include "tagutils.h"
 
-#include "mpcfile.h"
 #include "id3v1tag.h"
 #include "id3v2header.h"
 #include "apetag.h"

taglib/mpc/mpcproperties.cpp

@@ -23,12 +23,13 @@
  *   http://www.mozilla.org/MPL/                                           *
  ***************************************************************************/
 
+#include "mpcproperties.h"
+
 #include "tstring.h"
 #include "tdebug.h"
 #include <bitset>
 #include <cmath>
 
-#include "mpcproperties.h"
 #include "mpcfile.h"
 
 using namespace TagLib;