CMake 4 support #80

[cmake] CMake Deprecation Warning at build/Configure Clang Debug/_deps/mathgeolib-src/CMakeLists.txt:1 (cmake_minimum_required):
[cmake]   Compatibility with CMake < 3.10 will be removed from a future version of
[cmake]   CMake.
[cmake] 
[cmake]   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
[cmake]   to tell CMake that the project requires at least <min> but has been updated
[cmake]   to work with policies introduced by <max> or earlier.