cmake: fix build in `epel7` buildroot #313

Job	Run time
Ubuntu 22.04 (clang++)	2m 0s
Ubuntu 24.04 (g++ with sanitizers)	5m 46s
Ubuntu 22.04 (g++)	1m 23s
Ubuntu 24.04 (clang++ with sanitizers)	3m 57s
	13m 6s

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