Fix unused parameter warnings #11430

Job	Run time
htmldocs	25m 2s
cppcheck	2m 10s
package-arch (debian:bullseye)	29m 6s
package-indep (debian:bullseye)	43m 21s
package-arch (debian:bookworm)	30m 0s
package-indep (debian:bookworm)	33m 46s
rip-and-test	27m 11s
package-arch (debian:sid)	30m 19s
rip-and-test-clang	27m 38s
package-indep (debian:sid)	39m 13s
	4h 47m 46s

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