LONDON — Tyson Fury showed little rust in dominating Arslanbek Makhmudov for a unanimous decision victory Saturday and immediately challenged a ringside Anthony Joshua to fight him next. “Let’s give the fight fans what they want,” Fury bellowed after going 12 rounds in his latest comeback. A long-awaited Fury-Joshua heavyweight showdown would be one of the biggest fights in British boxing history. Joshua sat ringside and appeared to be using his phone to film portions of the fight at Tottenham