Fixes to target-spec #1351

Job	Run time
Cross-compile to aarch64	1m 34s
Build and test core crates (ubuntu-latest, 1.78)	2m 1s
Build and test (all features) (ubuntu-latest, 1.78)	3m 8s
Build and test core crates (ubuntu-latest, stable)	1m 40s
Build and test (all features) (ubuntu-latest, stable)	3m 9s
Build and test core crates (macos-14, 1.78)	1m 47s
Build documentation (ubuntu-latest)	1m 9s
Build and test (all features) (macos-14, 1.78)	2m 36s
Build and test core crates (macos-14, stable)	1m 41s
Build and test (all features) (macos-14, stable)	3m 28s
Build and test core crates (windows-latest, 1.78)	5m 4s
Lint	1m 7s
Build and test (all features) (windows-latest, 1.78)	8m 11s
Build and test core crates (windows-latest, stable)	3m 57s
Build and test (all features) (windows-latest, stable)	7m 10s
cargo-compare extended tests (ubuntu-latest)	1m 14s
cargo-compare extended tests (macos-14)	1m 16s
	50m 12s

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