os: skip size test in TestLstat if the file is a symlink
Tested by temporarily changing sysdir to use a directory where
the expected files were all symlinks. We should consider using
a different approach that doesn't rely on sysdir, but for now
do a minimal fix.
Fixes #57210
Change-Id: Ifb1becef03e014ceb48290ce13527b3e103c0e07
Reviewed-on: https://go-review.googlesource.com/c/go/+/456557 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Bryan Mills <bcmills@google.com>
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