Change to use patch version in the Windows installer
This changes the version in the Graphviz installer .exe produced by
CMake to use the patch version number instead of the build
date. Still, if the patch version is "$GRAPHVIZ_VERSION_DATE", the
patch version will be set to the build date. This conforms with how
the Linux packages are created.
This change affects the filename of the installer, the version
presented to the user in the installer GUI, the installation path and
the version presented by the running software.
projects / graphviz / commit