[CMake] Why does ExternalProject require root access?

[Ansis Māliņš]

There is no Bullet package for Ubuntu. But most importantly there is no
such thing as packages in Windows. So I have to build it into my app.

I also want to avoid having to alter the CMake files of my dependencies. I
want other devs to be able to just check out the latest version of Bullet
into a specific folder and hit compile on my meta project.
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