fix: unix.Timespec/Timeval member type various

[boypt]

unix.Timespec/unix.Timeval members are int32 in 32-bit arch

• https://github.com/golang/sys/blob/master/unix/ztypes_linux_arm.go#L24
• https://github.com/golang/sys/blob/master/unix/ztypes_linux_386.go#L24

But time.Unix always accept int64 arguments. Type casting is needed.

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[notti]

@boypt Any chance on signing the CLA?

[boypt]

@googlebot I signed it!

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[boypt]

@notti CLA signed, tks

[notti]

Thanks for the fix.