chore: moved core out #564

Job	Run time
Build Libretro (1.74.0)	1m 1s
Build SDL (1.78.0)	8m 15s
Build Libretro Android (1.74.0)	1m 55s
Build Libretro (1.75.0)	1m 0s
Build SDL (1.79.0)	8m 15s
Build (1.74.0)	4m 57s
Build Libretro Android (1.75.0)	1m 57s
Build Libretro (1.76.0)	1m 1s
Build (1.75.0)	4m 48s
Build SDL (1.80.0)	8m 6s
Build Libretro (1.77.0)	1m 1s
Build Libretro Android (1.76.0)	1m 53s
Build (1.76.0)	4m 53s
Build SDL (latest)	8m 6s
Build Libretro Android (1.77.0)	1m 55s
Build Libretro (1.78.0)	59s
Build (1.77.0)	4m 49s
Build Libretro Android (1.78.0)	1m 54s
Build Libretro (1.79.0)	1m 2s
Build Libretro Android (1.79.0)	1m 55s
Build Libretro (1.80.0)	59s
Build (1.78.0)	4m 56s
Build Libretro Android (1.80.0)	1m 56s
Build Simple (1.74.0)	1m 16s
Build Libretro (latest)	55s
Build (1.79.0)	5m 0s
Build Libretro Android (latest)	1m 49s
Build Simple (1.75.0)	1m 15s
Build Simple (1.76.0)	1m 14s
Build (1.80.0)	4m 43s
Build (latest)	4m 42s
Build WASM (1.78.0, 18)	3m 42s
Build Simple (1.77.0)	1m 12s
Build WASM (1.79.0, 18)	3m 53s
Build Simple (1.78.0)	1m 12s
Build WASM (1.80.0, 18)	3m 52s
Build Simple (1.79.0)	1m 14s
Build WASM (1.82.0, 18)	3m 47s
Build Simple (1.80.0)	1m 13s
Build WASM (latest, 18)	3m 41s
Build Simple (latest)	1m 12s
	2h 3m 25s

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