moved InputPlugin to decoder_api.h

InputPlugin is the API which is implemented by a decoder plugin.  This
belongs to the public API/ABI, so move it to decoder_api.h.  It will
later be renamed to something like "decoder_plugin".

src/inputPlugins/_flac_common.c

@@ -19,7 +19,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#include "../inputPlugin.h"
+#include "../decoder_api.h"
 
 #if defined(HAVE_FLAC) || defined(HAVE_OGGFLAC)
 

src/inputPlugins/_ogg_common.c

@@ -19,8 +19,6 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#include "../inputPlugin.h"
-
 #include "_flac_common.h"
 #include "_ogg_common.h"
 

src/inputPlugins/_ogg_common.h

@@ -22,7 +22,7 @@
 #ifndef _OGG_COMMON_H
 #define _OGG_COMMON_H
 
-#include "../inputPlugin.h"
+#include "../decoder_api.h"
 
 #if defined(HAVE_OGGFLAC) || defined(HAVE_OGGVORBIS) || \
   (defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7)

src/inputPlugins/flac_plugin.c

@@ -22,6 +22,7 @@
 
 #include "../utils.h"
 #include "../log.h"
+#include "../inputPlugin.h"
 
 /* this code was based on flac123, from flac-tools */