Define HAVE_AF_INET6_H for Netware too, as Guenter Knauf's builds indicate.

Makefile.netware

@@ -306,6 +306,7 @@ else
 	@echo $(DL)#define HAVE_SYS_SOCKET_H 1$(DL) >> $@
 	@echo $(DL)#define HAVE_SYS_SOCKIO_H 1$(DL) >> $@
 	@echo $(DL)#define HAVE_NETDB_H 1$(DL) >> $@
+	@echo $(DL)#define HAVE_AF_INET6_H 1$(DL) >> $@
 endif
 ifdef OLD_NOVELLSDK
 	@echo $(DL)#define socklen_t int$(DL) >> $@