uip/mhbuildsbr.c: Remove unusused MAXURLTOKEN macro.
uip/mhbuildsbr.c: Remove unusused MAXURLTOKEN macro.

"Maximum size of URL token in message/external-body".
Uses deleted in 95ad91ca30e1cda09efe454d12ed790a60661f56.

mcr/nmh,mcr/nmh