Fix file_stream_provider
example compilation failure on windows
#10975
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Which issue does this PR close?
Closes #.
Rationale for this change
file_stream_provider
example depends onnix
crate which not support windows os. We could use cfg to avoid compilation failure on windows.What changes are included in this PR?
Not change any code, just move code behind cfg flag.
Are these changes tested?
Are there any user-facing changes?