CMake: fix swig/csharp/CMakeLists.txt compatibility with CMake 3.31 #11255
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that no longer accept invalid PRE_BUILD keyword in OUTPUT form of add_custom_command() per https://cmake.org/cmake/help/latest/policy/CMP0175.html
Should fix error of https://github.com/OSGeo/gdal/actions/runs/11805369849/job/32887659405?pr=11254