Fix Windows CI failures. #3252

Job	Run time
ubuntu-latest [CC gcc; botan; shared libs on; GnuPG stable]	3m 19s
cmake-offline-googletest-src	1m 48s
ubuntu-latest [CC clang; botan; shared libs on; GnuPG stable]	2m 10s
ubuntu-latest [CC gcc; openssl; shared libs on; GnuPG stable]	1m 54s
cmake-offline-googletest	1m 56s
ubuntu-latest [CC clang; openssl; shared libs on; GnuPG stable]	1m 48s
ubuntu-20.04 [CC gcc; openssl; shared libs on; GnuPG stable]	3m 9s
ubuntu-latest [CC gcc; botan; shared libs off; GnuPG stable]	1m 57s
system-sexpp, sexpp shared libs on, rnp shared libs on	2m 52s
system-sexpp, sexpp shared libs on, rnp shared libs off	1m 56s
system-sexpp, sexpp shared libs off, rnp shared libs on	1m 56s
package-source	37s
system-sexpp, sexpp shared libs off, rnp shared libs off	3m 0s
package	1s
debian-tests	1s
	28m 24s

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