Harmonize source headers: C examples (Patch 4/5)

example/drives.c

@@ -17,7 +17,11 @@
 
 /* Simple program to show drivers installed and what the default 
    CD-ROM drive is and what CD drives are available. */
-#include <cdio/cdio.h>
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#define __CDIO_CONFIG_H__ 1
+#endif
+
 #ifdef HAVE_STDIO_H
 #include <stdio.h>
 #endif
@@ -27,6 +31,8 @@
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
+
+#include <cdio/cdio.h>
 #include <cdio/cd_types.h>
 #include <cdio/logging.h>