freeradius proxy can't recognize Delegated-IPv6-Prefix attribute

[Alan DeKok]

ichiro tanaka wrote:
> auth-server reply attribute "Delegated-IPv6-Prefix", but proxy recognize "Attr-123 = 0x00401234567890abcdef0000000000000000".

  Fix the proxy so that it's using the dictionaries from 2.1.10.  The
debug *claims* it's 2.1.10, but the Delegated-IPv6-Prefix attribute *is*
defined in the dictionaries for 2.1.10.

  Alan DeKok.