Include the global loader to avoid cpp warnings.

* Makes sure things are done in the right order.
diff --git a/contiki-cpc/loader/loader-arch-cpc.c b/contiki-cpc/loader/loader-arch-cpc.c
index 84d12be..33ca988 100644
--- a/contiki-cpc/loader/loader-arch-cpc.c
+++ b/contiki-cpc/loader/loader-arch-cpc.c
@@ -1,4 +1,4 @@
-#include "loader-arch.h"
+#include "loader.h"
 #include "rel.h"
 #include <stddef.h>
 #include <malloc.h>