Add fucking clever faketty() function.

Generally when stdout was redirected to a file or piped to a process,
it will enter buffering mode for better performance.

ref:
https://stackoverflow.com/questions/1401002/trick-an-application-into-thinking-its-stdin-is-interactive-not-a-pipe
https://stackoverflow.com/questions/2871462/fake-output-stream-type
https://bugs.winehq.org/show_bug.cgi?id=37345

e.g.,
faketty wine mpeg4recorder -i 172.16.7.12 --url '/mod.sdp?tsmode=90' --rtsp 554 | tee output