net/packet/checksum: copy the gvisor checksum, remove the dep

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As part of making Tailscale's gvisor dependency optional for small builds,
this was one of the last places left that depended on gvisor. Just copy
the couple functions were were using.

Updates #17283

Change-Id: Id2bc07ba12039afe4c8a3f0b68f4d76d1863bbfe
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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