Generating CPACK_PACKAGE_VERSION variable no longer supports non-digit versions as MINOR or PATCH version parts
We have previously used a script to add the current GIT SHA or SVN revision number as the patch version when the CPack script executes.
Our CMake script have relied on setting the CPACK_PACKAGE_VERSION_PATCH variable to a alphanumeric sequence which gets replaced during the execution of the generated CPack script. This have worked until CMake 3.12.0. This version assumes that CPACK_PACKAGE_VERSION_MINOR and CPACK_PACKAGE_VERSION_PATCH are digits.
It seems rather presuming to ban everything but digits. Our script may be a special case, but there are other projects out there which uses letters to indicate version (for example libjpeg).
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