base: Split into Dockerfile.in and common.docker

So common.docker can be re-used in other images that are not built FROM base.

common.docker

@@ -0,0 +1,37 @@
+WORKDIR /usr/share
+RUN git clone "https://github.com/nojhan/liquidprompt.git" && \\
+  cd liquidprompt && \\
+  git checkout v_1.11
+COPY imagefiles/.bashrc /root/
+
+WORKDIR /usr/src
+RUN git clone "https://cmake.org/cmake.git" CMake && \\
+   cd CMake && \\
+   git checkout v3.6.1 && \\
+   cd .. && mkdir CMake-build && cd CMake-build && \\
+   /usr/src/CMake/bootstrap \\
+     --parallel=$(nproc) \\
+     --prefix=/usr && \\
+   make -j$(nproc) && \\
+   ./bin/cmake -DCMAKE_USE_SYSTEM_CURL:BOOL=ON \\
+     -DCMAKE_BUILD_TYPE:STRING=Release \\
+     -DCMAKE_USE_OPENSSL:BOOL=ON . && \\
+   make install && \\
+   cd .. && \\
+   rm -rf CMake*
+
+RUN git clone "https://github.com/martine/ninja.git" && \\
+   cd ninja && \\
+   git checkout v1.7.1 && \\
+   python ./configure.py --bootstrap && \\
+   ./ninja && \\
+   cp ./ninja /usr/bin/ && \\
+   cd .. && rm -rf ninja
+COPY imagefiles/cmake.sh /usr/local/bin/cmake
+COPY imagefiles/ccmake.sh /usr/local/bin/ccmake
+
+RUN echo "root:root" | chpasswd
+WORKDIR /work
+ENTRYPOINT ["/dockcross/entrypoint.sh"]
+
+COPY imagefiles/entrypoint.sh imagefiles/dockcross /dockcross/