Fix Windows CI failures. #3255

Job	Run time
cmake-offline-googletest	2m 2s
ubuntu-latest [CC gcc; botan; shared libs on; GnuPG stable]	1m 53s
ubuntu-latest [CC clang; botan; shared libs on; GnuPG stable]	1m 50s
cmake-offline-googletest-src	1m 51s
ubuntu-latest [CC gcc; openssl; shared libs on; GnuPG stable]	1m 50s
ubuntu-latest [CC clang; openssl; shared libs on; GnuPG stable]	2m 6s
ubuntu-20.04 [CC gcc; openssl; shared libs on; GnuPG stable]	2m 16s
system-sexpp, sexpp shared libs on, rnp shared libs on	2m 12s
ubuntu-latest [CC gcc; botan; shared libs off; GnuPG stable]	1m 51s
package-source	38s
system-sexpp, sexpp shared libs on, rnp shared libs off	2m 1s
system-sexpp, sexpp shared libs off, rnp shared libs on	2m 1s
system-sexpp, sexpp shared libs off, rnp shared libs off	1m 51s
package	1m 9s
debian-tests	9s
	25m 40s

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