[CMake] Give clear warning if --build, -E or --find-package

[Claudio C]

I have seen this issue has been closed:
https://cmake.org/Bug/view.php?id=16093#bugnotes

I understand the synopsis shows that those "options" (so they are called)
have to be given as first, but I think then it should be made explicit in
the option description and/or cmake should give a clear error if such an
option doesn't appear as first.


-- 
  Ing. Claudio Caraffi, PhD
   E-Mail: claudio.caraffi at gmail.com
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