👷 Protect against boost_mp11 coming from boost #978

Job	Run time
valgrind	6m 9s
sanitize (thread, clang)	6m 10s
mutate	5m 31s
sanitize (address, gcc)	6m 9s
sanitize (undefined, clang)	6m 9s
quality_checks_pass	50s
sanitize (address, clang)	6m 9s
sanitize (thread, gcc)	5m 21s
sanitize (undefined, gcc)	5m 27s
build_and_test_24 (clang, 18, 23, libstdc++, Debug)	5m 3s
build_and_test_24 (clang, 21, 23, libc++, Debug)	3m 38s
build_and_test_24 (clang, 19, 23, libstdc++, Debug)	5m 20s
build_and_test_24 (clang, 19, 23, libc++, Debug)	5m 20s
build_and_test_24 (clang, 20, 23, libstdc++, Debug)	5m 19s
build_and_test_24 (clang, 20, 23, libc++, Debug)	6m 10s
build_and_test_24 (gcc, 14, 23, libstdc++, Debug)	5m 19s
build_and_test_24 (gcc, 12, 23, libstdc++, Debug)	4m 28s
build_and_test_24 (clang, 21, 23, libstdc++, Debug)	5m 19s
build_and_test_24 (clang, 18, 23, libc++, Debug)	4m 27s
build_and_test_24 (clang, 22, 23, libstdc++, Debug)	5m 19s
build_and_test_24 (clang, 22, 23, libc++, Debug)	3m 40s
build_and_test_24 (gcc, 13, 23, libstdc++, Debug)	3m 39s
merge_ok	1s
	1h 50m 57s

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