Fix tests #780

Job	Run time
package-arch (debian:buster)	27m 4s
package-indep (debian:buster)	40m 27s
htmldocs	22m 36s
package-arch (debian:bullseye)	28m 1s
rip-and-test	23m 37s
package-indep (debian:bullseye)	38m 6s
package-arch (debian:bookworm)	29m 30s
package-indep (debian:bookworm)	29m 43s
rip-and-test-clang	23m 37s
package-arch (debian:sid)	29m 58s
package-indep (debian:sid)	31m 3s
	5h 23m 42s

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