libstd: use block buffering when stdout is not a TTY#60904

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Arcterus wants to merge 3 commits intorust-lang:masterfrom

Arcterus:stdout-buffering

Commits on May 17, 2019

libstd: use block buffering when stdout is not a TTY
Arcterus
committed
libstd: default to line buffering rather than block buffering for stdout
Arcterus
committed

Commits on May 18, 2019

libstd: use the TTY detection code from atty on Windows
Arcterus
committed