Fix #14910: Wrong tokenization of qualified function-pointer member definition #20344

Job	Run time
build_cmake (ubuntu:25.10, true, true)	5m 32s
build_cmake (ubuntu:24.04, true, true)	5m 32s
build_cmake (alpine:3.23, false, false)	4m 56s
build_make (alpine:3.23)	6m 15s
build_make (ubuntu:25.10)	5m 19s
build_make (ubuntu:24.04)	4m 40s
	32m 14s

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