Minimal distro to build openwrt image

For the (newer) OpenWrt buildslaves we also use a base Debian 9 Docker image with the following packages:

RUN apt-get update && \
    apt-get install -y \
        pwgen \
        locales \
        buildbot-slave \
        build-essential \
        git-core \
	subversion \
        libncurses5-dev \
        gawk \
        unzip \
        wget \
	curl \
        ccache \
        rsync

This can be trimmed down some more since pwgen, buildbot-slave, ccache and rsync are not really required to build OpenWrt.

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