patch 8.2.0591: MS-Windows: should always support IPv6
Problem: MS-Windows: should always support IPv6
Solution: Add build flag. (Ozaki Kiichi, closes #5944)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index fa14c9e..e95a94a 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -467,7 +467,7 @@
!if "$(CHANNEL)" == "yes"
CHANNEL_PRO = proto/channel.pro
CHANNEL_OBJ = $(OBJDIR)/channel.obj
-CHANNEL_DEFS = -DFEAT_JOB_CHANNEL
+CHANNEL_DEFS = -DFEAT_JOB_CHANNEL -DFEAT_IPV6
NETBEANS_LIB = WSock32.lib Ws2_32.lib
!endif