Only force CMAKE_INSTALL_PREFIX if the user didn't specify it. #4603
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Forcing an override of
CMAKE_INSTALL_PREFIXis not friendly, since users might expect to set it themselves when they run cmake.We have a real-world use case where we do set this ourselves when running cmake. We build the libraries on each platform separately, setting
CMAKE_INSTALL_PREFIXto a nice place outside of the source. Only afterwards do we combine all of the results from each platform and put them in the final location.