cross 0.2.3

Zero setup cross compilation and cross testing
Documentation
FROM ubuntu:16.04
ARG DEBIAN_FRONTEND=noninteractive

COPY common.sh lib.sh /
RUN /common.sh

COPY cmake.sh /
RUN /cmake.sh

COPY xargo.sh /
RUN /xargo.sh

RUN apt-get update && apt-get install --assume-yes --no-install-recommends \
    g++-s390x-linux-gnu \
    libc6-dev-s390x-cross

COPY qemu.sh /
RUN /qemu.sh s390x softmmu

COPY dropbear.sh /
RUN /dropbear.sh

COPY linux-image.sh /
RUN /linux-image.sh s390x

COPY linux-runner /

ENV CARGO_TARGET_S390X_UNKNOWN_LINUX_GNU_LINKER=s390x-linux-gnu-gcc \
    CARGO_TARGET_S390X_UNKNOWN_LINUX_GNU_RUNNER="/linux-runner s390x" \
    CC_s390x_unknown_linux_gnu=s390x-linux-gnu-gcc \
    CXX_s390x_unknown_linux_gnu=s390x-linux-gnu-g++ \
    BINDGEN_EXTRA_CLANG_ARGS_s390x_unknown_linux_gnu="--sysroot=/usr/s390x-linux-gnu" \
    QEMU_LD_PREFIX=/usr/s390x-linux-gnu \
    RUST_TEST_THREADS=1 \
    PKG_CONFIG_PATH="/usr/lib/s390x-linux-gnu/pkgconfig/:${PKG_CONFIG_PATH}"