More source headers harmonization

* fix missing #ifdefs
* remove spaces and page feeds
* follow same set of rules everywhere, with cdio includes coming
  after standard C includes.

test/testdefault.c

@@ -20,12 +20,9 @@
    and cdio_free_device_list()
 */
 #ifdef HAVE_CONFIG_H
-# include "config.h"
-# define __CDIO_CONFIG_H__ 1
+#include "config.h"
+#define __CDIO_CONFIG_H__ 1
 #endif
-#include <cdio/cdio.h>
-#include <cdio/cd_types.h>
-#include <cdio/logging.h>
 
 #ifdef HAVE_STDIO_H
 #include <stdio.h>
@@ -36,7 +33,13 @@
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
 #endif
+#ifdef HAVE_STRING_H
 #include <string.h>
+#endif
+
+#include <cdio/cdio.h>
+#include <cdio/cd_types.h>
+#include <cdio/logging.h>
 
 static void 
 log_handler (cdio_log_level_t level, const char message[])