http: suppress "flags may be used uninitialized in this function" error Some GCC reports [1]: /home/runner/work/libevent/libevent/http.c: In function ‘evhttp_make_header’: /home/runner/work/libevent/libevent/http.c:503:14: error: ‘flags’ may be used uninitialized in this function [-Werror=maybe-uninitialized] ev_uint16_t flags; ^~~~~ /home/runner/work/libevent/libevent/http.c: In function ‘evhttp_get_body’: /home/runner/work/libevent/libevent/http.c:2354:14: error: ‘flags’ may be used uninitialized in this function [-Werror=maybe-uninitialized] ev_uint16_t flags; ^~~~~ [1]: https://github.com/libevent/libevent/runs/7263518338?check_suite_focus=true#logs