dont request Boost.system component

Arch Linux’s Boost 1.89 update removed the compiled libboost_system.so, as boost::system is now a header-only library. This change caused CMake target failures across the Lomiri stack (process-cpp, dbus-cpp, mir, etc.), all of which referenced Boost::system.

This MR removes system from find_package(Boost … COMPONENTS …). The code continues to build and run correctly on both newer (header-only) and older (pre-1.69) Boost versions.

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