The files in the `bilke` folder were manually copy and pasted from the
[cmake-modules repository](https://github.com/bilke/cmake-modules). It was decided to do
this because only a small subset of its provided functions are needed.

The files in the `rpavlik` folder were manually copy and pasted from the
[cmake-modules repository](https://github.com/rpavlik/cmake-modules). It was decided to do
this because only a small subset of its provided functions are needed.