Do not allow 64 bit ciphers for encryption without explicit option. #3687

Job	Run time
cmake-offline-googletest	4m 10s
cmake-offline-googletest-src	4m 2s
ubuntu-latest [CC gcc; botan; shared libs on; GnuPG stable]	4m 11s
ubuntu-latest [CC clang; botan; shared libs on; GnuPG stable]	4m 5s
system-sexpp, sexpp shared libs on, rnp shared libs on	2m 46s
ubuntu-latest [CC gcc; openssl; shared libs on; GnuPG stable]	4m 6s
system-sexpp, sexpp shared libs on, rnp shared libs off	2m 56s
ubuntu-latest [CC clang; openssl; shared libs on; GnuPG stable]	4m 50s
system-sexpp, sexpp shared libs off, rnp shared libs on	3m 1s
ubuntu-20.04 [CC gcc; openssl; shared libs on; GnuPG stable]	3m 42s
system-sexpp, sexpp shared libs off, rnp shared libs off	2m 43s
ubuntu-latest [CC gcc; botan; shared libs off; GnuPG stable]	4m 11s
package-source	29s
package	1m 20s
debian-tests	9s
	46m 41s

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