File README.SUSE.PACKAGING of Package haproxy

Packaging notes regarding QUIC:

By default we enable QUIC with OpenSSL for Tumbleweed. OpenSSL is not the perfect fit - the best recommendation by HAProxy currently seems to be AWS-LC:
https://github.com/haproxy/wiki/wiki/SSL-Libraries-Support-Status#tldr

The project configuration can be adjusted to enable QUIC with AWS-LC:

```
Macros:
%_with_awslc 1
# for < 1600
%_with_quic 1
:Macros
```