[fix] Better fix for libSDL2-2.0.so.0 (#3893)
[fix] Better fix for libSDL2-2.0.so.0 (#3893)

Systems with libSDL2.so seem to have libSDL2-2.0.so.0, but those without only have libSDL2-2.0.so.0
NiLuJe/koreader,houqp/koreader,koreader/koreader,NiLuJe/koreader,lgeek/koreader,Hzj-jie/koreader,mwoz123/koreader,Frenzie/koreader,Frenzie/koreader,koreader/koreader,pazos/koreader,poire-z/koreader,poire-z/koreader,Markismus/koreader,mihailim/koreader