Rust

Fix unused warnings if log-debugcon is not enabled #5532

Job	Run time
Integration Test (AArch64)	1m 9s
Integration Test (x86_64)	1m 20s
Build (stable MSRV)	31s
Lints	1m 19s
Unit + Doc Tests	1m 43s
Integration Test (IA-32)	1m 31s
Integration Test (x86_64 Windows)	4m 2s
Build (feature permutations)	3m 33s
Build Standard Binary (nightly)	26s
Unit + Doc Tests (Miri)	1m 7s
Nightly (build, test, doc)	2m 24s
	19m 5s

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