Use VERSION file to manage DTK version. VERSION file defines package version. It also decides the initial value of cached variable DTK_VERSION which controls the project version in cmake build system. VERSION file is not synchronized to DTK6, as DTK6 has its own VERSION file. One can still pass version to DTK_VERSION when running cmake configure. This is helpful for developers.
Signed-off-by: Yixue Wang <wangyixue@deepin.org>
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Yixue Wang