Fixes potential ABI mismatch between libmatroska and libc whin CONFIG_FILEPOS_64 is defined

That prevents ABI mismatch with recent Android NDK.

corec/corec/helpers/file/file_libc.c

@@ -27,7 +27,7 @@
  *
  ****************************************************************************/
 
-#include "file.h"
+#include "config.h"
 
 #ifdef CONFIG_FILEPOS_64
 #define __USE_FILE_OFFSET64
@@ -48,6 +48,8 @@
 #include <sys/vfs.h>
 #endif
 
+#include "file.h"
+
 #if defined(O_ACCMODE)
 #define _RW_ACCESS_FILE  (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
 #define _RW_ACCESS_DIR  (S_IRWXU|S_IRWXG|S_IRWXO)