py3: use email parser that operates on bytes
email.parser.Parser() operates on str in both Python 2 and 3.
Python 3.2 introduced the email.parser.BytesParser(), which works
like Parser except it accepts bytes.
We implement the pycompat helper as a function so we lazily
import the "email" module.
Differential Revision: https://phab.mercurial-scm.org/D2147
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