(merge) Issue #11395: io.FileIO().write() clamps the data length to 32,767

bytes on Windows if the file is a TTY to workaround a Windows bug. The Windows
console returns an error (12: not enough space error) on writing into stdout if
stdout mode is binary and the length is greater than 66,000 bytes (or less,
depending on heap usage).

diff --cc Lib/test/test_os.py
Simple merge

diff --cc Misc/NEWS
Simple merge