libyang REFACTOR config.h code split

... into compat.h and version.h.
diff --git a/src/xpath.h b/src/xpath.h
index a5ea377..4fb601a 100644
--- a/src/xpath.h
+++ b/src/xpath.h
@@ -18,7 +18,7 @@
 #include <stdint.h>
 #include <stddef.h>
 
-#include "config.h"
+#include "compat.h"
 #include "log.h"
 #include "plugins_types.h"
 #include "tree_schema.h"