Fix header install #1533

Job	Run time
build-test-downstream (ubuntu-24.04, clang-18)	2m 8s
build (ubuntu-24.04, clang-18)	4m 45s
build-test-downstream (ubuntu-24.04, gcc-14)	2m 53s
build (ubuntu-24.04, gcc-14)	7m 25s
build-test-downstream (macos-13, clang-14)	2m 20s
build-test-downstream (macos-14, armv8-clang-14)	1m 48s
build (macos-13, clang-14)	7m 13s
build-test-downstream (windows-2022, msvc-1940)	3m 5s
build (macos-14, armv8-clang-14)	3m 12s
build (windows-2022, msvc-1940)	3m 21s
test (ubuntu-24.04, clang-18)	1m 48s
docker (ubuntu-24.04, clang-18)	20s
test (ubuntu-24.04, gcc-14)	1m 58s
test (macos-13, clang-14)	2m 57s
test (macos-14, armv8-clang-14)	1m 53s
	47m 6s

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