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https://buildbot.torproject.org/tor-master/builders/master-win32/builds/416/steps/shell_3/logs/stdio says

cc1.exe: warnings being treated as errors
dns.c: In function 'purge_expired_resolves':
dns.c:457:9: error: comparison between signed and unsigned integer expressions
dns.c: In function 'dns_resolve_impl':
dns.c:684:3: error: comparison between signed and unsigned integer expressions
dns.c: In function 'assert_all_pending_dns_resolves_ok':
dns.c:852:7: error: comparison between signed and unsigned integer expressions
dns.c: In function 'dns_cancel_pending_resolve':
dns.c:958:5: error: comparison between signed and unsigned integer expressions

These are lines like

        tor_assert(pend->conn->_base.s == TOR_INVALID_SOCKET);

Looks related to commit 6e8c2a3e, from work on #4533 (moved).