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main/linux-postmarketos-allwinner: enable TCPMSS match functionality

Administrator requested to merge kernel-tcpmss into master

TCPMSS target (CONFIG_IP_NF_TARGET_TCPMSS) is already enabled but match (CONFIG_IP_NF_MATCH_TCPMSS) was not.

the rule

iptables -t nat -A POSTROUTING -o $GSMIF -m policy --dir out --pol ipsec -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1199:9000 -j TCPMSS --set-mss 1200

is failing with the following error

iptables v1.8.7 (legacy): Couldn't load match `tcpmss':No such file or directory

Try `iptables -h' or 'iptables --help' for more information.

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