quagga: fixing multiple vulnerabilities (important)

This update fixes the following security issues: - 718056: OSPF6D buffer overflow while decoding Link State Update with Inter Area Prefix Lsa CVE-2011-3323 - 718058: OSPF6D DoS while decoding Database Description packet CVE-2011-3324 - 718059: OSPFD DoS while decoding Hello packet CVE-2011-3325 -...