[issue13609] Add "os.get_terminal_size()" function

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Using strace, I see that stty calls ioctl(TIOCGWINSZ) on stdin (fd=0)
if it failed on stdout (fd=1), whereas Python only tries stdout.

Attached patch implements a similar idea.

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Added file: http://bugs.python.org/file24503/get_terminal_size_pipe.patch

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