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Help: Add that CMAKE_CACHEFILE_DIR might not be defined

Tobias Nießen requested to merge help-variables-cmakecachefiledir-might-not-be-defined into master

CMake only sets CMAKE_CACHEFILE_DIR when writing CMakeCache.txt, so the variable will usually be undefined when CMakeLists.txt runs. I ran into this problem myself, and using CMAKE_BINARY_DIR works even before CMakeLists.txt has been written.

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