Make native-only loaders optional on Emscripten #1166

Job	Run time
Test windows-2022	1m 1s
Test macos-15	43s
ci / Build	5m 45s
ci / Lint	6m 50s
ci / Decompiler Snapshot Testing (0)	1m 25s
ci / Typecheck	2m 56s
ci / Test (4)	12m 37s
ci / Test (3)	12m 44s
ci / Test (7)	11m 1s
ci / Test (5)	21m 36s
ci / Test (2)	17m 51s
ci / Test (0)	13m 54s
ci / Test (8)	8m 46s
ci / Test (1)	18m 20s
ci / Test (9)	6m 52s
ci / Test (6)	11m 17s
ci / Publish Unit Tests Results	4s
	2h 33m 42s

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