Meson only runs required targets. The key_encrypted_pem and
cert_encrypted_pem targets added in 020b0db090dc8e197cbedbdc4db7e3120eda5333
and 8191fd8e6c5a27e034a34084afe61f17a9420cfa weren't added to the list
of targets required by the test target, so the generation of the
encrypted certs was skipped, resulting in the failure of
BindServerTest.BindAndListenSeparatelySSLEncryptedKey.