[CMake] External project clean

[Evgeny Startsev]

How can i "not clean" external projects, on which this project depends,
when i clean this project? I want some "shared" external projects, used
from different projects. When i write "make clean" i want clean only
current project binaries and keep all external projects (for example,
massive external projects such as OpenCV). Is it possible without manual
changes in External Project module.
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