Fix `EkuError` unused warning on windows #589

Job	Run time
Clippy (-Zbuild-std)	37s
Clippy (stable) (ubuntu-latest)	45s
Clippy (MSRV) (ubuntu-latest)	2m 41s
Clippy (stable) (macos-latest)	28s
Clippy (MSRV) (macos-latest)	2m 5s
Test (ubuntu-latest)	14s
Clippy (stable) (windows-latest)	59s
Clippy (MSRV) (windows-latest)	3m 19s
Test (macos-latest)	20s
Test (windows-latest)	44s
Test (Android)	4m 17s
Test (FreeBSD)	3m 25s
Ktlint	43s
Check for documentation errors	12s
Rustfmt	12s
Verify Android artifacts	1m 7s
	22m 8s

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