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Add 5.5.0 CMSG handlers #1283

Job	Run time
build (ubuntu-latest, Release)	1m 43s
build (ubuntu-latest, Debug)	1m 46s
build (windows-latest, Debug)	2m 42s
build (macos-14, Debug)	1m 15s
build (windows-latest, Release)	2m 33s
build (macos-14, Release)	1m 31s
	11m 30s

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