libyang UPDATE add prefix for common and config files

To avoid include conflicts.
diff --git a/src/xpath.c b/src/xpath.c
index 139cd0f..a1308d5 100644
--- a/src/xpath.c
+++ b/src/xpath.c
@@ -24,11 +24,11 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "common.h"
 #include "compat.h"
 #include "context.h"
 #include "dict.h"
 #include "hash_table.h"
+#include "ly_common.h"
 #include "out.h"
 #include "parser_data.h"
 #include "path.h"