tests: suppress "Checked out 1 paths of <hash>" from modern git
test-convert-git.t is failiing since git commit 0f086e6dca (checkout:
print something when checking out paths, 2018-11-13). Suppress the new
output by disambiguating the arguments with a "--" separator.
Differential Revision: https://phab.mercurial-scm.org/D5625
# See http://EditorConfig.org for the specification
root = true
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[*.{c,h}]
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indent_style = tab
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[*.t]
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