CMake

Fix ra-test execution of svnserve in some build environments (closes … #221

Job	Run time
Windows, shared, x64, with tests	11m 51s
Windows, shared, x64, vs2022, with tests	12m 8s
Windows, shared, x86	2m 49s
Windows, static, x64, with tests	11m 4s
Linux, shared, with tests	4m 26s
	42m 18s

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