Return None in autodetect_on_cargo_feature on other platforms #7729

Job	Run time
Check	8m 40s
cargo test \| windows	14m 56s
Check MSRV	17s
Clippy	9m 11s
Docs	8m 49s
Rustfmt	39s
matrix_test (aarch64-apple-darwin, macos-latest, 1.79.0, false, test, --all --tests)	9m 59s
nix (ubuntu-latest)	7m 30s
matrix_test (x86_64-apple-darwin, macos-13, 1.79.0, false, test, --all --tests)	17m 57s
Playwright Tests	18m 35s
nix (macos-latest)	9m 4s
matrix_test (aarch64-apple-ios, macos-latest, 1.79.0, false, build, --package dioxus-mobile)	1m 38s
matrix_test (aarch64-linux-android, ubuntu-latest, 1.79.0, true, build, --package dioxus-mobile)	3m 21s
Test Suite with Optimizations	10m 45s
Test Suite	10m 42s
	2h 12m 3s

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