include config.h in all sources

After we've been hit by Large File Support problems several times in
the past week (which only occur on 32 bit platforms, which I don't
have), this is yet another attempt to fix the issue.

src/decoder/_ogg_common.c

@@ -21,8 +21,8 @@
  * Common functions used for Ogg data streams (Ogg-Vorbis and OggFLAC)
  */
 
+#include "config.h"
 #include "_ogg_common.h"
-#include "../utils.h"
 
 ogg_stream_type ogg_stream_type_detect(struct input_stream *inStream)
 {