Review Request 60311: Windows: Replaced use of `_stat()` with `os::stat::isdir()`.

[Andrew Schwartzmeyer]

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https://reviews.apache.org/r/60311/
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Review request for mesos, Alexander Rukletsov, Jeff Coffler, John Kordich, 
Joseph Wu, Li Li, and Michael Park.


Bugs: MESOS-6817, MESOS-7371 and MESOS-7407
    https://issues.apache.org/jira/browse/MESOS-6817
    https://issues.apache.org/jira/browse/MESOS-7371
    https://issues.apache.org/jira/browse/MESOS-7407


Repository: mesos


Description
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This removes hairy, duplicated code which did not support long paths.


Diffs
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  3rdparty/stout/include/stout/internal/windows/reparsepoint.hpp 
a9228437bc1b2b287dd19cb9903ce048db2a90ef 


Diff: https://reviews.apache.org/r/60311/diff/1/


Testing
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Thanks,

Andrew Schwartzmeyer