message: Fedora dockerfile uses required CMake version
  As ISPC now requires CMake 3.13 make sure the docker image has the correct version.
  Additionally update to download from the github release page as it has better download speeds.
diff: @@ -13,9 +13,9 @@ RUN dnf install -y vim wget yum-utils gcc gcc-c++ git subversion python3 m4 biso
  RUN dnf install -y ncurses-static libstdc++-static zlib-static glibc-static && \
  dnf clean -y all
  -# Download and install required version of cmake (3.12) for ISPC build
  -RUN wget https://cmake.org/files/v3.12/cmake-3.12.0-Linux-x86_64.sh && mkdir /opt/cmake && sh cmake-3.12.0-Linux-x86_64.sh --prefix=/opt/cmake --skip-license && \
  - ln -s /opt/cmake/bin/cmake /usr/local/bin/cmake && rm cmake-3.12.0-Linux-x86_64.sh
  +# Download and install required version of cmake (3.13) for ISPC build
  +RUN wget https://github.com/Kitware/CMake/releases/download/v3.13.5/cmake-3.13.5-Linux-x86_64.sh && mkdir /opt/cmake && sh cmake-3.13.5-Linux-x86_64.sh --prefix=/opt/cmake --skip-license && \
  + ln -s /opt/cmake/bin/cmake /usr/local/bin/cmake && rm cmake-3.13.5-Linux-x86_64.sh
  # If you are behind a proxy, you need to configure git and svn.
  #RUN git config --global --add http.proxy http://proxy.yourcompany.com:888
  