libyang UPDATE add prefix for common and config files

To avoid include conflicts.
diff --git a/src/plugins.c b/src/plugins.c
index 011e464..1e46d4d 100644
--- a/src/plugins.c
+++ b/src/plugins.c
@@ -29,8 +29,8 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "common.h"
-#include "config.h"
+#include "ly_common.h"
+#include "ly_config.h"
 #include "plugins_exts.h"
 #include "plugins_types.h"
 #include "set.h"