Add socket headers for FreeBSD

[iblislin]

I got this on FreeBSD

/home/iblis/git/mosquitto/lib/socks_mosq.c:105:18: error: variable has incomplete type 'struct in6_addr'                                                                     
        struct in6_addr addr_ipv6;
                        ^
/home/iblis/git/mosquitto/lib/socks_mosq.c:105:9: note: forward declaration of 'struct in6_addr'                                                                             
        struct in6_addr addr_ipv6;
               ^
/home/iblis/git/mosquitto/lib/socks_mosq.c:149:32: error: use of undeclared identifier 'AF_INET'                                                                             
                ipv4_pton_result = inet_pton(AF_INET, mosq->host, &addr_ipv4);
                                             ^
/home/iblis/git/mosquitto/lib/socks_mosq.c:150:32: error: use of undeclared identifier 'AF_INET6'                                                                            
                ipv6_pton_result = inet_pton(AF_INET6, mosq->host, &addr_ipv6);

[karlp]

people have been building mosuqitto on netbsd/freebsd/openbsd for years, is there something particualr in your environment that is making this pop up now? Did you just change your libc or anything?

[iblislin]

I'm upgrading FreeBSD ports from 1.4.13 to 1.5.3.

I just upstream this patch.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231047

[iblislin]

1.5.1 can build without this patch, but 1.5.3 not.

[ralight]

I'd like to include this in the 1.5.4 release, the only thing holding me back is that you've not signed the Eclipse Contributor Agreement. You should read the whole thing, but it's essentially saying that you assert you have the right to contribute the code. If you would like to sign it, please just head over to https://accounts.eclipse.org/user/eca and do so, using the same email address as in the commit. There is no need to change the PR, just mention that you've signed and I'll manually make the check.

[iblislin]

okay, I singed it.

[ralight]

Lovely! Thanks very much for keeping FreeBSD up to date.