Add scripts to build manylinux1 wheels

This allows building portable manylinux1 wheels using docker.

python/wheelbuilder/Dockerfile

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+FROM quay.io/pypa/manylinux1_x86_64
+
+# Configure ld.so/ldconfig and pkg-config
+RUN echo /usr/local/lib64 > /etc/ld.so.conf.d/local.conf && \
+    echo /usr/local/lib >> /etc/ld.so.conf.d/local.conf
+ENV PKG_CONFIG_PATH /usr/local/lib64/pkgconfig:/usr/local/lib/pkgconfig
+
+# Install meson and ninja
+ENV NINJA_VERSION v1.8.2
+RUN /opt/python/cp37-cp37m/bin/pip install meson
+RUN cd /usr/bin && ln -s /opt/_internal/cpython-3.7.0/bin/meson
+RUN curl -L -O https://github.com/ninja-build/ninja/releases/download/${NINJA_VERSION}/ninja-linux.zip
+RUN unzip ninja-linux.zip && mv ninja /usr/bin/ninja
+
+# Install a recent zlib, needed by libetpan
+ENV ZLIB_VERSION 1.2.11
+RUN curl -O https://www.zlib.net/zlib-${ZLIB_VERSION}.tar.gz
+RUN tar xzf zlib-${ZLIB_VERSION}.tar.gz
+RUN cd zlib-${ZLIB_VERSION} && ./configure
+RUN cd zlib-${ZLIB_VERSION} && make
+RUN cd zlib-${ZLIB_VERSION} && make install
+RUN ldconfig -v
+
+# Install a recent Perl, needed to install OpenSSL
+ENV PERL_VERSION 5.28.0
+RUN curl -O https://www.cpan.org/src/5.0/perl-${PERL_VERSION}.tar.gz
+RUN tar xzf perl-${PERL_VERSION}.tar.gz
+RUN cd perl-${PERL_VERSION} && ./Configure -de
+RUN cd perl-${PERL_VERSION} && make
+RUN cd perl-${PERL_VERSION} && make install
+
+# Install OpenSSL
+ENV OPENSSL_VERSION 1.1.1a
+RUN curl -O https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz
+RUN tar xzf openssl-${OPENSSL_VERSION}.tar.gz
+RUN cd openssl-${OPENSSL_VERSION} && \
+    ./config shared no-ssl2 no-ssl3 -fPIC --prefix=/usr/local
+RUN cd openssl-${OPENSSL_VERSION} && \
+    sed -i "s/^SHLIB_MAJOR=.*/SHLIB_MAJOR=200/" Makefile && \
+    sed -i "s/^SHLIB_MINOR=.*/SHLIB_MINOR=0.0/" Makefile && \
+    sed -i "s/^SHLIB_VERSION_NUMBER=.*/SHLIB_VERSION_NUMBER=200.0.0/" Makefile
+RUN cd openssl-${OPENSSL_VERSION} && make depend
+RUN cd openssl-${OPENSSL_VERSION} && make
+RUN cd openssl-${OPENSSL_VERSION} && make install_sw install_ssldirs
+
+RUN ldconfig -v
+
+# Install cyrus-sasl
+ENV SASL_VERSION 2.1.27
+RUN curl -O ftp://ftp.cyrusimap.org/cyrus-sasl/cyrus-sasl-${SASL_VERSION}.tar.gz
+RUN tar zxf cyrus-sasl-${SASL_VERSION}.tar.gz
+RUN cd cyrus-sasl-${SASL_VERSION} && \
+    ./configure --disable-silent-rules \
+                --disable-cmulocal \
+                --disable-sample \
+                --disable-obsolete_cram_attr \
+                --disable-obsolete_digest_attr \
+                --disable-staticdlopen \
+                --disable-java \
+                --disable-alwaystrue \
+                --enable-checkapop \
+                --enable-cram \
+                --enable-digest \
+                --enable-scram \
+                --disable-otp \
+                --disable-srp \
+                --disable-srp-setpass \
+                --disable-krb4 \
+                --disable-gssapi \
+                --disable-gss_mutexes \
+                --disable-sia \
+                --disable-auth-sasldb \
+                --disable-httpform \
+                --enable-plain \
+                --enable-anon \
+                --enable-login \
+                --disable-ntlm \
+                --disable-passdss \
+                --disable-sql \
+                --disable-ldapdb \
+                --disable-macos-framework
+RUN cd cyrus-sasl-${SASL_VERSION} && make
+RUN cd cyrus-sasl-${SASL_VERSION} && make install
+RUN ldconfig -v
+
+# Install libetpan
+ENV ETPAN_VERSION 1.9.1
+RUN curl -L -o libetpan-${ETPAN_VERSION}.tar.gz \
+    https://github.com/dinhviethoa/libetpan/archive/${ETPAN_VERSION}.tar.gz
+RUN tar xzf libetpan-${ETPAN_VERSION}.tar.gz
+RUN cd libetpan-${ETPAN_VERSION} && ./autogen.sh && \
+    ./configure --enable-ipv6 \
+                --disable-iconv --disable-db \
+                --with-openssl --with-sasl --with-zlib \
+                --without-curl --without-expat
+RUN cd libetpan-${ETPAN_VERSION} && make
+RUN cd libetpan-${ETPAN_VERSION} && make install
+RUN ldconfig -v

python/wheelbuilder/build-wheels.sh

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+#!/bin/bash
+set -e -x
+
+## Build the library
+meson /builddir /io
+pushd /builddir
+ninja
+ninja install
+ldconfig -v
+popd
+
+## Compile wheels
+for PYBIN in /opt/python/*/bin; do
+    "${PYBIN}/pip" install cffi requests attrs six pytest
+    "${PYBIN}/pip" wheel /io/python -w wheelhouse/
+done
+
+## Bundle external shared libraries into the wheels
+for whl in wheelhouse/*.whl; do
+    auditwheel repair "$whl" -w /io/python/wheelhouse/
+done
+
+# Clean up the cffi wheels which end up in the wheelhouse
+rm -rf /io/python/wheelhouse/cffi*.whl
+
+## Install packages (and test)
+for PYBIN in /opt/python/*/bin/; do
+    "${PYBIN}/pip" install deltachat --no-index -f /io/python/wheelhouse
+    # (cd "$HOME"; "${PYBIN}/pytest" /io/python/tests)
+done