rhg: refactor to pass argv down, instead of caling args_os()
This refactoring makes it easy to patch some command-line preprocessing into rhg.
We use this to support using rhg as a shebang interpreter, for example.
Differential Revision: https://phab.mercurial-scm.org/D12543
# See http://EditorConfig.org for the specification
root = true
[*.py]
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end_of_line = lf
[*.{c,h}]
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[*.t]
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