unused includes (#1133)

* unused includes

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* Use consistent order of includes

Always include in the following order:
- Own header files
- Standard header files
- System header files
- Project header files (toolkit first)

Exceptions:
- cppunit/extensions/HelperMacros.h must be included after
  header files declaring stream operators
- config.h must be included before its definitions are used

---------

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Co-authored-by: Urs Fleisch <ufleisch@users.sourceforge.net>

bindings/c/tag_c.cpp

@@ -19,13 +19,18 @@
  *   USA                                                                   *
  ***************************************************************************/
 
-#ifdef HAVE_CONFIG_H
-# include  "config.h"
-#endif
+#include "tag_c.h"
 
 #include <cstdlib>
-#include "fileref.h"
+#include <cstring>
+#include <utility>
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
 #include "tfile.h"
+#include "tpropertymap.h"
+#include "fileref.h"
 #include "asffile.h"
 #include "vorbisfile.h"
 #include "mpegfile.h"
@@ -37,12 +42,7 @@
 #include "trueaudiofile.h"
 #include "mp4file.h"
 #include "tag.h"
-#include <cstring>
-#include <utility>
 #include "id3v2framefactory.h"
-#include "tpropertymap.h"
-
-#include "tag_c.h"
 
 using namespace TagLib;