Fix #14604 & #10343: Implicit return type in typedefs #19455

Job	Run time
build_cmake (ubuntu:24.04, true, true)	5m 22s
build_make (ubuntu:25.10)	18m 36s
build_cmake (alpine:3.23, false, false)	4m 13s
build_make (ubuntu:24.04)	1m 27s
build_cmake (ubuntu:25.10, true, true)	5m 11s
build_make (alpine:3.23)	5m 57s
	40m 46s

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