buildroot

quagga: security bump to version 1.1.1

Fixes CVE-2017-5495: Telnet interface input buffer allocates unbounded amounts
of memory, leading to DoS.

Add optional dependency on protobuf-c.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>