fix no getPageLinks method in djvudocument
fix no getPageLinks method in djvudocument

lgeek/koreader,chrox/koreader,mihailim/koreader,NiLuJe/koreader,ashhher3/koreader,Frenzie/koreader,robert00s/koreader,Markismus/koreader,poire-z/koreader,noname007/koreader,houqp/koreader,koreader/koreader,Frenzie/koreader,Hzj-jie/koreader,pazos/koreader,ashang/koreader,mwoz123/koreader,apletnev/koreader,frankyifei/koreader,NiLuJe/koreader,poire-z/koreader,chihyang/koreader,koreader/koreader,NickSavage/koreader