use only one process for emu input event emulation
use only one process for emu input event emulation

Seems that SDL is not thread-safe, so forking leads to some
strange bugs. Thus I switch back to one process implementaion.

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