Fix the #include order for config.h.
Add #include "config.h" directives where needed.

diff --git a/files/drive.c b/files/drive.c
index 9a8882e..809e536 100644
--- a/files/drive.c
+++ b/files/drive.c
@@ -10,6 +10,7 @@
  *
  */
 
+#include "config.h"
 #include "wine/port.h"
 
 #include <assert.h>