👷 Protect against boost_mp11 coming from boost #979

Job	Run time
mutate	2m 12s
valgrind	2m 12s
quality_checks_pass	2m 12s
sanitize (undefined, gcc)	2m 12s
sanitize (address, gcc)	2m 12s
sanitize (thread, gcc)	2m 12s
sanitize (thread, clang)	2m 12s
sanitize (undefined, clang)	2m 12s
build_and_test_24 (clang, 19, 23, libstdc++, Debug)	2m 12s
build_and_test_24 (clang, 18, 23, libstdc++, Debug)	2m 12s
build_and_test_24 (clang, 21, 23, libc++, Debug)	2m 12s
build_and_test_24 (clang, 20, 23, libc++, Debug)	2m 12s
build_and_test_24 (clang, 22, 23, libc++, Debug)	2m 12s
build_and_test_24 (gcc, 12, 23, libstdc++, Debug)	2m 12s
build_and_test_24 (clang, 22, 23, libstdc++, Debug)	2m 12s
build_and_test_24 (clang, 18, 23, libc++, Debug)	2m 12s
build_and_test_24 (clang, 19, 23, libc++, Debug)	2m 12s
build_and_test_24 (gcc, 14, 23, libstdc++, Debug)	2m 12s
build_and_test_24 (gcc, 13, 23, libstdc++, Debug)	2m 12s
sanitize (address, clang)	2m 12s
build_and_test_24 (clang, 21, 23, libstdc++, Debug)	2m 12s
build_and_test_24 (clang, 20, 23, libstdc++, Debug)	2m 12s
merge_ok	1s
	48m 25s

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