👷 Protect against boost_mp11 coming from boost #980

Job	Run time
mutate	5m 40s
sanitize (undefined, clang)	5m 36s
sanitize (address, gcc)	4m 51s
sanitize (thread, clang)	5m 58s
quality_checks_pass	51s
sanitize (undefined, gcc)	4m 46s
valgrind	5m 38s
sanitize (thread, gcc)	4m 52s
sanitize (address, clang)	6m 3s
build_and_test_24 (clang, 18, 23, libc++, Debug)	7m 40s
build_and_test_24 (gcc, 13, 23, libstdc++, Debug)	4m 43s
build_and_test_24 (clang, 18, 23, libstdc++, Debug)	5m 35s
build_and_test_24 (clang, 19, 23, libc++, Debug)	6m 40s
build_and_test_24 (clang, 21, 23, libstdc++, Debug)	5m 55s
build_and_test_24 (clang, 22, 23, libc++, Debug)	6m 14s
build_and_test_24 (clang, 19, 23, libstdc++, Debug)	6m 7s
build_and_test_24 (clang, 20, 23, libc++, Debug)	6m 23s
build_and_test_24 (clang, 22, 23, libstdc++, Debug)	6m 17s
build_and_test_24 (clang, 21, 23, libc++, Debug)	6m 0s
build_and_test_24 (gcc, 12, 23, libstdc++, Debug)	4m 25s
build_and_test_24 (clang, 20, 23, libstdc++, Debug)	6m 3s
build_and_test_24 (gcc, 14, 23, libstdc++, Debug)	4m 56s
merge_ok	4s
	2h 1m 17s

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