patch 8.2.1661: cannot connect to 127.0.0.1 for host with only IPv6 addresses

Problem:    Cannot connect to 127.0.0.1 for host with only IPv6 addresses.
Solution:   pass AI_V4MAPPED flag to getaddrinfo. (Filipe Brandenburger,
            closes #6931)
diff --git a/src/version.c b/src/version.c
index 47b1e56..77f17f6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1661,
+/**/
     1660,
 /**/
     1659,