unix: fix AF_CAN tests for big endian systems

[skladd]

see discussion in https://go-review.googlesource.com/c/sys/+/248977

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This PR (HEAD: 33cf644) has been imported to Gerrit for code review.

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Message from Tobias Klauser:

Patch Set 1: Run-TryBot+1

(1 comment)

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Message from Gobot Gobot:

Patch Set 1:

SlowBots beginning. Status page: https://farmer.golang.org/try?commit=5c1a59e2

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Message from Gobot Gobot:

Patch Set 1: TryBot-Result+1

SlowBots are happy.
SlowBot builds that ran:

• linux-ppc64-buildlet
• linux-s390x-ibm

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Message from Tobias Klauser:

Patch Set 1: Code-Review+2

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This PR is being closed because golang.org/cl/249743 has been merged.