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Warn if CMAKE_CROSSCOMPILING is true without CMAKE_SYSTEM_NAME set

Martin Storsjö requested to merge mstorsjo/cmake:crosscompiling-warn-reset into master

Also clarify the CMAKE_CROSSCOMPILING documentation to state that CMake sets the variable automatically.

Original Description In this case, CMakeDetermineSystem.cmake overrides the preexisting setting value of CMAKE_CROSSCOMPILING in nonobvious ways; warn the user and let him/her know that CMAKE_SYSTEM_NAME needs to be set if cross compiling.
Edited by Brad King

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