os: fix TestRootChtimes on illumos
TestRootChtimes currently fails on illumos [1] because the times
returned by os.Stat have only microsecond precision on that builder.
Truncate them to make the test pass again.
[1] https://build.golang.org/log/
9780af24c3b3073dae1d827b2b9f9e3a48912c30
Change-Id: I8cf895d0b60c854c27cb4faf57c3b44bd40bfdd4
Reviewed-on: https://go-review.googlesource.com/c/go/+/664915
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