Appveyor install libevent[thread] vcpkg
Appveyor install libevent[thread] vcpkg

As per #17586 the default libevent vcpkg install now has thread disabled. This PR installs libevent with the thread feature enabled.


Former-commit-id: 1ed7dd161fe03b91e1e0607cc78d9731f60cbbe5
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin