hgweb: use our forked wsgiheaders module instead of stdlib one
Now we use bytes for headers, rather than native strings.
Differential Revision: https://phab.mercurial-scm.org/D2854
FROM ubuntu:__CODENAME__
RUN apt-get update && apt-get install -y \
build-essential \
debhelper \
devscripts \
dh-python \
less \
python \
python-all-dev \
python-docutils \
unzip \
zip