fix unused warning on statistics in default features config #667

Job	Run time
Coverage	1m 25s
Deny	16s
Test features --no-default-features	1m 12s
Clippy	57s
Test features --no-default-features --features=hash	1m 44s
Test features --no-default-features --features=object	1m 9s
Rust 1.65.0	2m 24s
Rustfmt	11s
Test features --no-default-features --features=process	1m 10s
Test linux	2m 21s
Test features --no-default-features --features=hash,object	1m 13s
Test linux32	2m 1s
Test features --no-default-features --features=object,authenticode	1m 5s
Test Macos 12	4m 15s
Test features --no-default-features --features=object,authenticode,authenticode-verify	1m 14s
Test windows	3m 49s
Test features --all-features	1m 22s
Test windows32	4m 15s
	32m 3s

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