threads_win: fix build error with VS2010 #25812

Job	Run time
check_docs	1m 1s
check_update	1m 32s
address_ub_sanitizer	11m 18s
basic_gcc	5m 40s
check-ansi	2m 33s
basic_clang	6m 17s
fuzz_tests	2m 56s
memory_sanitizer	19m 22s
minimal	2m 30s
no-deprecated	5m 42s
non-caching	15m 13s
no-shared-macos (macos-13)	5m 55s
no-shared-ubuntu	4m 19s
no-shared-macos (macos-14)	3m 35s
self-hosted (freebsd-13.2)	14m 42s
threads_sanitizer	5m 19s
self-hosted (ubuntu-arm64-22.04)	9m 34s
enable_non-default_options	4m 39s
external-test-pyca (1.51.0, 3.9)	7m 35s
external-test-cf-quiche	4m 7s
external-tests	12m 0s
full_featured	6m 50s
legacy	5m 12s
no-legacy	5m 36s
out-of-readonly-source-and-install-macos (macos-13)	10m 13s
out-of-readonly-source-and-install-ubuntu	7m 47s
out-of-readonly-source-and-install-macos (macos-14)	5m 41s
	3h 7m 8s

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