A system SDL2 that does not define SDL_JOYSTICK_HIDAPI (sdl2-compat over
SDL3 ships no such macro, and neither does a build with the driver
disabled) fails pad_sdl and makes the disk audio driver open the port
with a different channel count, so ANYPS5_USE_SYSTEM_DEPS=ON now rejects
it with a named error, like the VK_KHR_maintenance8 check. Ubuntu's real
SDL2 defines the macro through its SDL_config.h indirection and is
unaffected.
SPIRV-Tools only exports SPIRV-Tools-static when built with
SPIRV_TOOLS_BUILD_STATIC=ON; distributions that ship it shared expose
SPIRV-Tools instead, so a shared target is aliased to the static name.
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