illumos build fixes + require libevent2

libevent 1 doesn't have the socket id wrapper. since version 2 is 10
years old we should fail to build on version 1.

explicit cast to avoid possible pedantic build flags complains (ie can be the old iovec interface)

1 files changed, 1 insertions, 1 deletions

diff --git a/memcached.c b/memcached.c
index 1c5fce0..3ce7d73 100644
--- a/memcached.c
+++ b/memcached.c
@@ -2670,7 +2670,7 @@ static enum transmit_result transmit_udp(conn *c) {
     msg.msg_namelen = resp->request_addr_size;
 
     // First IOV is the custom UDP header.
-    iovs[0].iov_base = udp_hdr;
+    iovs[0].iov_base = (void *)udp_hdr;
     iovs[0].iov_len = UDP_HEADER_SIZE;
     build_udp_header(udp_hdr, resp);
     iovused++;