CMake Nightly Date Stamp
CPack/NSIS: Obtain path from which to uninstall from registry (#14124)

Without this, when CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL is set,
the installer tries to uninstall the old version from the default
installation path for the new version, rather than using the path from
the registry where the old version is installed.
Merge topic 'cpack-nsis-uninstall' into next

40566ef CPack/NSIS: Obtain path from which to uninstall from registry (#14124)
e9e088a CMake Nightly Date Stamp