Fix warnings when building with all-targets, no-default-features (#5212) #2076

Job	Run time
WASM Demo	2m 15s
Check Credentials for jobs that need JSON credentials	2s
bench-binsize	2m 52s
bench-memory (macos-latest)	3m 52s
bench-memory (ubuntu-latest)	3m 47s
bench-memory (windows-latest)	7m 9s
bench-perf (components/collections)	4m 28s
bench-perf (components/datetime)	4m 23s
bench-perf (components/locale)	2m 38s
bench-perf (components/locale_core)	5m 21s
bench-perf (components/plurals)	6m 6s
bench-perf (provider/blob)	3m 23s
bench-perf (components/segmenter)	3m 46s
bench-perf (utils/fixed_decimal)	6m 15s
bench-perf (utils/litemap)	2m 7s
bench-perf (utils/tinystr)	6m 32s
bench-perf (utils/writeable)	3m 40s
bench-perf (utils/zerotrie)	5m 49s
bench-perf (utils/zerovec)	8m 31s
Rust docs	5m 0s
C++ docs	2m 1s
Dart docs	1m 33s
TypeScript docs	42s
Deploy to GitHub Pages	17m 33s
	1h 49m 45s

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