Bugfix: Tolerate flags in coinbase prefix we provided
Bugfix: Tolerate flags in coinbase prefix we provided

pointgaming/point-gaming-btc,uingei/eloi,imsaguy/eloipool,jameshilliard/4tar-eloipool,thrasher-/eloipool,ahmedbodi/SHA-Eloipool-MMCFE-,wizkid057/eloipool,thrasher-/eloipool,svasva/eloipool,thrasher-/eloipool,cinnamoncoin/eloipool-1,uingei/eloipool