ifdef to fix URL_DECODE issue when libevent is not linked
ifdef to fix URL_DECODE issue when libevent is not linked


Former-commit-id: a1b09fe92adf1294dd5ec4893ad481696eddbfda
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin