CMakeLists path logic fails if path has space in it

[swernli]

For our various folders with native code, several of them use CMake variables to get the paths to current or relative folders. However, when using those as folders for include paths (-I) or library search paths (-L) these variables can cause problems if the underlying paths have spaces in them. This varies from difficulty finding dependent libraries to link against to failure to find headers. Some amount of escaped quotes will be needed in the right places and with the right patterns to get this working.

As a work around, clone the repo into a folder path with no spaces.