Fixed build on MSVC.

src/core/ngx_inet.c

diff --git a/src/core/ngx_inet.c b/src/core/ngx_inet.c
index 3590ee6..c4aaf3a 100644
--- a/src/core/ngx_inet.c
+++ b/src/core/ngx_inet.c
@@ -581,7 +581,7 @@
         return rc;
     }
 
-    ngx_inet_set_port(addr->sockaddr, port);
+    ngx_inet_set_port(addr->sockaddr, (in_port_t) port);
 
     return NGX_OK;
 }

src/mail/ngx_mail_auth_http_module.c

diff --git a/src/mail/ngx_mail_auth_http_module.c b/src/mail/ngx_mail_auth_http_module.c
index 5aaff8e..a94434a 100644
--- a/src/mail/ngx_mail_auth_http_module.c
+++ b/src/mail/ngx_mail_auth_http_module.c
@@ -809,7 +809,7 @@
                 return;
             }
 
-            ngx_inet_set_port(peer->sockaddr, port);
+            ngx_inet_set_port(peer->sockaddr, (in_port_t) port);
 
             len = ctx->addr.len + 1 + ctx->port.len;