e0c2405594
The XOAUTH2 support was added in47eda8e, overriding `SASL_PATH` and dropping all default SASL mechanisms from `cyrus_sasl`. The option was disabled by default infe02c5e, but users manually overriding isync to enable `withCyrusSaslXoauth2` still face this issue. This commit sets `SASL_PATH` to a combination of `cyrus_sasl` and `cyrus-sasl-xoauth2`, as suggested in #235959.