gtk.cfg: Remove pure annotation from g_str_has_prefix/suffix #20615

Job	Run time
build_cmake (alpine:3.23, false, false)	3m 27s
build_cmake (ubuntu:24.04, true, true)	3m 4s
build_make (ubuntu:24.04)	4m 57s
build_cmake (ubuntu:25.10, true, true)	3m 24s
build_make (alpine:3.23)	6m 12s
build_make (ubuntu:25.10)	3m 49s
	24m 53s

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