libyang UPDATE add prefix for common and config files

To avoid include conflicts.
diff --git a/src/xml.c b/src/xml.c
index 2bdbdf3..f509445 100644
--- a/src/xml.c
+++ b/src/xml.c
@@ -23,9 +23,9 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "common.h"
 #include "compat.h"
 #include "in_internal.h"
+#include "ly_common.h"
 #include "out_internal.h"
 #include "tree.h"
 #include "tree_schema_internal.h"