board/httpd: enable IPv6 support (and ifconfig) #38

Job	Run time
supervisor (curios-nftables) / build (amd64)	1m 46s
supervisor (curios-ntpd) / build (amd64)	3m 50s
supervisor (curios) / build (amd64)	5m 44s
supervisor (curios-nftables) / build (arm64)	1m 55s
supervisor (curios-httpd) / build (amd64)	1m 49s
supervisor (curios-ntpd) / build (arm64)	3m 52s
supervisor (curios) / build (arm64)	5m 34s
supervisor (curios-httpd) / build (arm64)	1m 54s
supervisor (curios-nftables) / push	16s
supervisor (curios-httpd) / push	18s
supervisor (curios-ntpd) / push	16s
supervisor (curios) / push	45s
	27m 59s

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