psycstore: fix gnunet_my_lib and gnunet_mysql includes

search include_dirs rather than local repository

src/psycstore/plugin_psycstore_mysql.c

@@ -33,8 +33,8 @@
 #include <gnunet/gnunet_crypto_lib.h>
 #include "gnunet_psyc_util_lib.h"
 #include "psycstore.h"
-#include "gnunet_my_lib.h"
-#include "gnunet_mysql_lib.h"
+#include <gnunet/gnunet_my_lib.h>
+#include <gnunet/gnunet_mysql_lib.h>
 #include <mysql/mysql.h>
 
 /**