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

include/config.h.in

diff --git a/include/config.h.in b/include/config.h.in
index 93af9fa..bc7dd60 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -538,3 +538,6 @@
 /* Define if struct sockaddr_un contains sun_len */
 #undef HAVE_SOCKADDR_SUN_LEN
 
+/* This must always be defined to allow checking for config.h inclusion */
+#undef __WINE_CONFIG_H
+