refactor: separate structs of libretro #402

Job	Run time
Build SDL (1.74.0)	7m 41s
Build Libretro (1.70.0)	1m 21s
Build SDL (1.75.0)	7m 35s
Build (1.65.0)	2m 0s
Build Libretro (1.71.0)	1m 23s
Build SDL (1.76.0)	7m 31s
Build (1.66.0)	2m 6s
Build Libretro (1.72.0)	1m 14s
Build Libretro Android (1.71.0)	2m 52s
Build SDL (latest)	7m 21s
Build (1.67.0)	1m 58s
Build Libretro (1.73.0)	1m 20s
Build Libretro Android (1.72.0)	2m 44s
Build (1.68.0)	1m 57s
Build Libretro Android (1.73.0)	2m 44s
Build Libretro (latest)	1m 9s
Build (1.69.0)	1m 51s
Build Libretro Android (latest)	2m 30s
Build (1.70.0)	1m 18s
Build WASM (1.74.0, 16)	3m 8s
Build (1.71.0)	1m 15s
Build WASM (1.75.0, 16)	2m 57s
Build (1.72.0)	1m 22s
Build WASM (1.76.0, 16)	3m 7s
Build (1.73.0)	1m 14s
Build WASM (latest, 16)	3m 12s
Build (latest)	1m 4s
	1h 15m 54s

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