emulators/ppsspp: unbreak after r482190

SDL/SDLVulkanGraphicsContext.cpp:73:67: error: no member named 'wl' in 'SDL_SysWMinfo::<anonymous union at /usr/local/include/SDL2/SDL_syswm.h:198:5>'

vulkan_->InitSurface(WINDOWSYSTEM_WAYLAND, (void*)sys_info.info.wl.display,
                                                  ~~~~~~~~~~~~~ ^

PR: 223018
Reported by: pkg-fallout