decoder/sidplay: add header file

Makefile.am

@@ -618,7 +618,8 @@ endif
 
 if ENABLE_SIDPLAY
 libdecoder_plugins_a_SOURCES += \
-	src/decoder/SidplayDecoderPlugin.cxx
+	src/decoder/SidplayDecoderPlugin.cxx \
+	src/decoder/SidplayDecoderPlugin.hxx
 endif
 
 if ENABLE_FLUIDSYNTH

src/DecoderList.cxx

@@ -42,13 +42,12 @@
 #include "decoder/ModplugDecoderPlugin.hxx"
 #include "decoder/MpcdecDecoderPlugin.hxx"
 #include "decoder/FluidsynthDecoderPlugin.hxx"
+#include "decoder/SidplayDecoderPlugin.hxx"
 #include "system/FatalError.hxx"
 #include "util/Macros.hxx"
 
 #include <string.h>
 
-extern const struct decoder_plugin sidplay_decoder_plugin;
-
 const struct decoder_plugin *const decoder_plugins[] = {
 #ifdef HAVE_MAD
 	&mad_decoder_plugin,

src/decoder/SidplayDecoderPlugin.cxx

@@ -18,6 +18,7 @@
  */
 
 #include "config.h"
+#include "SidplayDecoderPlugin.hxx"
 #include "../DecoderAPI.hxx"
 #include "tag/TagHandler.hxx"
 #include "util/Domain.hxx"

src/decoder/SidplayDecoderPlugin.hxx

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_SIDPLAY_HXX
+#define MPD_DECODER_SIDPLAY_HXX
+
+extern const struct decoder_plugin sidplay_decoder_plugin;
+
+#endif