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cksum: NetBSD-adapted cksum()

Scott Michel requested to merge bscottmichel/libslirp-minimal:cksum-netbsd-update into master

[Looks like the original cksum() code was derived from a BSD implementation, looking at the copyright and version.]

Update cksum() to use more recent NetBSD-based checksum implementation. The updated implementation includes both a 64-bit and 32-bit (the default) implementations. The 64-bit implementation has a longer stride length, which may be beneficial to overall performance.

Update the return types for cksum() and ip6_cksum() to uint16_t, which is what the checksum algorithm computes.

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