CMake Fix, master branch (2020.11.09.)

Undid the modification from 8d895119. As that one is breaking the build of the project as soon as SQLite is not coming from /usr.

But @rbianchi, please speak up why you made that commit last week... With it reversed, I can build the code with a "cleaned up" version of atlas/atlasexternals!745 (merged) successfully. So we should figure out what it is that prevents you from building the code with this configuration. As this is definitely the correct configuration.