Added unordered_map reference to wiiext.h #1622

Job	Run time
call-node-workflow / build	36s
build (Pico)	3m 32s
build (PicoW)	2m 47s
build (AlpacaOwO)	3m 29s
build (BentoBox)	3m 1s
build (DURAL)	3m 54s
build (FightboardV3)	2m 47s
build (FightboardV3Mirrored)	2m 45s
build (FlatboxRev4)	2m 48s
build (FlatboxRev5)	3m 29s
build (FlatboxRev5RGB)	2m 51s
build (FlatboxRev5Southpaw)	2m 54s
build (KB2040)	2m 50s
build (KeyboardConverter)	2m 45s
build (Liatris)	3m 16s
build (MavercadeKeebfighter)	2m 44s
build (PicoAnn)	2m 47s
build (PicoFightingBoard)	3m 15s
build (ReflexCtrlSNES)	2m 50s
build (ReflexEncoder)	2m 42s
build (RP2040AdvancedBreakoutBoard)	3m 34s
build (RP2040MiniBreakoutBoard)	2m 44s
build (SparkFunProMicro)	4m 10s
build (WaveshareZero)	2m 45s
build (Stress)	3m 26s
build (SGFDevices)	2m 56s
	1h 17m 37s

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