test_upgrade: be more verbose, fixed build without poll()
test_upgrade: be more verbose, fixed build without poll()

ghaderer/libmicrohttpd,maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd