Same class of bug as the USE_DISCORD fix: add_compile_definitions() only
affects targets created after the call, but the whole USE_MINIUPNPC block
sat after add_library(Core STATIC ...). That meant Core/Util/PortManager.cpp,
built as part of that same add_library call, never actually saw WITH_UPNP
or any of the other miniupnpc defines - UPnP support was silently compiled
out on every platform.
Split the block: compile definitions and the miniupnpc source-file/include
setup now run before add_library(Core STATIC ...), while building the
bundled miniupnpc target and linking it into Core (which needs the Core
target to already exist) stays after, in its original spot.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01PSNaZnHCjmryS3ziVN9gZU