net/libslirp: Fix the layout of struct tcpiphdr #172
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The structure needs to be packed, otherwise four bytes of padding are added at the end, breaking some code at the end of tcp_output() which initializes the IP header. With sizeof(struct mbuf_ptr) == 8, this padding doesn't appear. Fixes: b960490 ("net/libslirp: Make purecap libslirp.so usable")
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This unbreaks TCP when using libslirp on CheriBSD.