SDL3 Add DSU joystick driver #14353
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SDL3 Add DSU joystick driver #14353
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Rebased on latest upstream
Disabled DSU joystick on Emscripten due to lack of UDP socket support. Updated socket initialization to use ioctl with FIONBIO for better compatibility on Unix-like systems. Refactored header includes and comments for clarity and platform correctness. Fixed variable naming in DSU data packet handling and removed unnecessary 'static' from inline functions in header.
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Introduces DSU client joystick support for SDL, enabling connection to DSU servers (such as DS4Windows and BetterJoy) to receive controller data over UDP, including motion sensors and touchpad data. Adds build system options, configuration hints, protocol implementation, and driver integration for Windows and other platforms.