py3: use bytes stdout in hghave.py
This fixes a failure in test-run-tests.t around notarealhghavefeature. It seems
crazy to me that all of this needs to be adjusted in all of these tests, but the
line as run-tests.py sees it in _processoutput() before doing anything is
already mangled with a trailing '\r'. Switching to normalizenewlines=True for
TTest works, but I'm sure that breaks other stuff.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false