Fix FileNotFoundError errors on tests when cmark is built from another project via add_subdirectory()

CMAKE_SOURCE_DIR will refer to the top-level source directory, not cmark, so CMAKE_CURRENT_SOURCE_DIR must be used. Also the same for CMAKE_BINARY_DIR. Ideally it should be using the TARGET_FILE CMake generator to get a target's location instead of hard coding the path, but that requires CMake 3.0 or greater.

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