Fix #14692 False positive: uninitialized variable, libcurl.cfg configuration #19588

Job	Run time
build_cmake (alpine:3.23, false, false)	4m 26s
build_make (ubuntu:24.04)	2m 56s
build_cmake (ubuntu:24.04, true, true)	2m 42s
build_make (alpine:3.23)	5m 58s
build_cmake (ubuntu:25.10, true, true)	5m 25s
build_make (ubuntu:25.10)	5m 6s
	26m 33s

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