[cmake] do not check none-existing variables #18491
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Then checking ROOTSYS, do not try to modify none-existing variables. Like LD_LIBRARY_PATH on windows. Also no need to change ROOTSYS if it set correctly
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Then checking ROOTSYS, do not try to modify
none-existing variables.
Like LD_LIBRARY_PATH on windows.
cmake on Windows simply fails when ROOTSYS set.
Also no need to change ROOTSYS if it set correctly