Fix running tests with Perl on Windows #152

Job	Run time
address_ub_sanitizer	14s
basic_clang	17s
basic_gcc	15s
buildtest	16s
check_docs	13s
check_update	36s
check-ansi	13s
enable_brotli_and_asan_ubsan	23s
enable_brotli_and_zstd_dynamic	18s
enable_brotli_dynamic	22s
enable_non-default_options	12s
enable_zstd_and_asan_ubsan	18s
enable_zstd_dynamic	21s
enable-tfo (ubuntu-latest)	1s
enable-tfo (macos-latest)	50s
external-test-cf-quiche	40s
external-test-pyca (1.51.0, 3.9)	57s
fips_and_ktls	13s
external-tests	1m 21s
legacy	19s
memory_sanitizer	13s
minimal	13s
no-deprecated	13s
no-legacy	14s
non-caching	13s
no-shared (ubuntu-latest)	1s
no-shared (macos-latest)	47s
out-of-source-and-install (ubuntu-latest)	14s
threads_sanitizer	20s
out-of-source-and-install (macos-latest)	27s
	11m 14s

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