Cleanup #includes of standard system headers and put them in one place

This will make refactoring features easier, especially now that
pthreads support and larger refactorings are on the horizon.

Hopefully, this will make porting to other platforms (even
non-UNIX-like ones for masochists) easier, too.

os_compat.h will house all the #includes for system headers
considered to be the "core" of MPD.  Headers for optional
features will be left to individual source files.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7130 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/inputPlugins/_flac_common.c

@@ -31,10 +31,8 @@
 #include "../outputBuffer.h"
 #include "../decode.h"
 #include "../replayGain.h"
+#include "../os_compat.h"
 
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
 #include <FLAC/format.h>
 #include <FLAC/metadata.h>
 

src/inputPlugins/_ogg_common.c

@@ -28,8 +28,7 @@
   (defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7)
 
 #include "../utils.h"
-
-#include <string.h>
+#include "../os_compat.h"
 
 ogg_stream_type ogg_stream_type_detect(InputStream * inStream)
 {

src/inputPlugins/aac_plugin.c

@@ -27,11 +27,8 @@
 #include "../log.h"
 #include "../inputStream.h"
 #include "../outputBuffer.h"
+#include "../os_compat.h"
 
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
 #include <faad.h>
 
 /* all code here is either based on or copied from FAAD2's frontend code */

src/inputPlugins/audiofile_plugin.c

@@ -27,14 +27,8 @@
 #include "../log.h"
 #include "../pcm_utils.h"
 #include "../playerData.h"
+#include "../os_compat.h"
 
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
 #include <audiofile.h>
 
 static int getAudiofileTotalTime(char *file)

src/inputPlugins/flac_plugin.c

@@ -27,11 +27,7 @@
 #include "../outputBuffer.h"
 #include "../replayGain.h"
 #include "../audio.h"
-
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <assert.h>
+#include "../os_compat.h"
 
 /* this code was based on flac123, from flac-tools */
 

src/inputPlugins/mod_plugin.c

@@ -25,14 +25,8 @@
 #include "../log.h"
 #include "../pcm_utils.h"
 #include "../playerData.h"
+#include "../os_compat.h"
 
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
 #include <mikmod.h>
 
 /* this is largely copied from alsaplayer */

src/inputPlugins/mp3_plugin.c

@@ -33,13 +33,7 @@
 #include "../tag.h"
 #include "../conf.h"
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <errno.h>
+#include "../os_compat.h"
 
 #define FRAMES_CUSHION    2000
 

src/inputPlugins/mp4_plugin.c

@@ -27,15 +27,11 @@
 #include "../inputStream.h"
 #include "../outputBuffer.h"
 #include "../decode.h"
+#include "../os_compat.h"
 
 #include "../mp4ff/mp4ff.h"
 
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
 #include <faad.h>
-
 /* all code here is either based on or copied from FAAD2's frontend code */
 
 static int mp4_getAACTrack(mp4ff_t * infile)

src/inputPlugins/mpc_plugin.c

@@ -27,14 +27,9 @@
 #include "../inputStream.h"
 #include "../outputBuffer.h"
 #include "../replayGain.h"
+#include "../os_compat.h"
 
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
 #include <mpcdec/mpcdec.h>
-#include <errno.h>
-#include <math.h>
 
 typedef struct _MpcCallbackData {
 	InputStream *inStream;

src/inputPlugins/oggflac_plugin.c

@@ -32,10 +32,7 @@
 #include "../outputBuffer.h"
 #include "../replayGain.h"
 #include "../audio.h"
-
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
+#include "../os_compat.h"
 
 static void oggflac_cleanup(FlacData * data,
 			    OggFLAC__SeekableStreamDecoder * decoder)

src/inputPlugins/oggvorbis_plugin.c

@@ -31,11 +31,7 @@
 #include "../inputStream.h"
 #include "../outputBuffer.h"
 #include "../replayGain.h"
-
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
+#include "../os_compat.h"
 
 #ifndef HAVE_TREMOR
 #include <vorbis/vorbisfile.h>
@@ -52,8 +48,6 @@
 #define ov_time_seek_page(VF, S) (ov_time_seek_page(VF, (S)*1000))
 #endif /* HAVE_TREMOR */
 
-#include <errno.h>
-
 #ifdef WORDS_BIGENDIAN
 #define OGG_DECODE_USE_BIGENDIAN	1
 #else

src/inputPlugins/wavpack_plugin.c

@@ -28,15 +28,9 @@
 #include "../pcm_utils.h"
 #include "../playerData.h"
 #include "../outputBuffer.h"
+#include "../os_compat.h"
 
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
 #include <wavpack/wavpack.h>
-#include <math.h>
 
 #define ERRORLEN 80