bump base (#4964)
bump base (#4964)

* Don't disable exp2 & log2 in LuaJIT https://github.com/koreader/koreader-base/pull/902
* fix incorrect merge with master from https://github.com/koreader/koreader-base/pull/843 https://github.com/koreader/koreader-base/pull/901
pazos/koreader,NiLuJe/koreader,houqp/koreader,koreader/koreader,poire-z/koreader,mihailim/koreader,Frenzie/koreader,mwoz123/koreader,Hzj-jie/koreader,Frenzie/koreader,Markismus/koreader,koreader/koreader,NiLuJe/koreader,poire-z/koreader