Don't try to report file size or timestamps for stdio streams. #4531
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Calling
File::metadata()
on a stdio stream handle fails on Windows, wherethe stdio streams are not files.
This
File::metadata()
call was effectively only being used to add file sizeand timestamps to the result of
filestat_get
. It's common for users toredirect stdio streams to interesting places, and applications
generally shouldn't change their behavior depending on the size or
timestamps of the file, if the streams are redirected to a file, so just
leave these fields to 0, which is commonly understood to represent
"unknown".
Fixes #4497.