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
Historically these were both added for the Makefile and Visual Studio generators, respectively. Later the VS generators started using the CMAKE_MAKE_PROGRAM cache entry to find the IDE build tool, and the CMAKE_BUILD_TOOL was simply set as an alias. Fix the documentation to explain that CMAKE_MAKE_PROGRAM is the modern variable and that CMAKE_BUILD_TOOL is the compatibility alias, not the other way around. Replace uses of CMAKE_BUILD_TOOL with CMAKE_MAKE_PROGRAM in CMake-provided modules. Nothing needs to lookup CMAKE_BUILD_TOOL in the cache, so simply set it as a normal variable.