Added unordered_map reference to wiiext.h #1621

Job	Run time
call-node-workflow / build	43s
build (Pico)	2m 59s
build (PicoW)	2m 52s
build (AlpacaOwO)	3m 21s
build (BentoBox)	2m 57s
build (DURAL)	3m 29s
build (FightboardV3)	2m 47s
build (FightboardV3Mirrored)	2m 46s
build (FlatboxRev4)	3m 43s
build (FlatboxRev5)	2m 46s
build (FlatboxRev5RGB)	2m 47s
build (FlatboxRev5Southpaw)	3m 35s
build (KB2040)	2m 51s
build (KeyboardConverter)	3m 4s
build (Liatris)	3m 25s
build (MavercadeKeebfighter)	2m 57s
build (PicoAnn)	2m 50s
build (PicoFightingBoard)	3m 13s
build (ReflexCtrlSNES)	2m 49s
build (ReflexEncoder)	3m 36s
build (RP2040AdvancedBreakoutBoard)	2m 47s
build (RP2040MiniBreakoutBoard)	2m 51s
build (SparkFunProMicro)	2m 45s
build (WaveshareZero)	2m 52s
build (Stress)	3m 23s
build (SGFDevices)	3m 30s
	1h 17m 38s

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