pub unsafe extern "C" fn libssh2_knownhost_addc( hosts: *mut LIBSSH2_KNOWNHOSTS, host: *const c_char, salt: *const c_char, key: *const c_char, keylen: size_t, comment: *const c_char, commentlen: size_t, typemask: c_int, store: *mut *mut libssh2_knownhost) -> c_int