Allow eternal to be used as a subdirectory #7
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Kind of strange it hasn't been caught before, but using
CMAKE_SOURCE_DIR
always refers to the root-most CMake project, not the Eternal directory (wherever it might exist).Changing it to
CMAKE_CURRENT_SOURCE_DIR
allows Eternal to properly set up the include paths of the interface target to refer to the subdirectory's location instead of the project root (which makes no sense).