community/isync: backport working for "unexpected EOF" errors

This problem only appears with OpenSSL 3. For this reason, isync
was previously build with OpenSSL 1.1. However, since it is now
build with OpenSSL 3 again the error reappeared but it turns
out there is an upstream workaround for it now.

See:

* baa872b6
* 9fa8f775