[fix, Ubuntu Touch] Actually bundle libSDL2.so! (#4946)
[fix, Ubuntu Touch] Actually bundle libSDL2.so! (#4946)

Accidentally broken in https://github.com/koreader/koreader/pull/2132.
NiLuJe/koreader,poire-z/koreader,Frenzie/koreader,pazos/koreader,poire-z/koreader,koreader/koreader,Hzj-jie/koreader,mwoz123/koreader,houqp/koreader,Frenzie/koreader,koreader/koreader,NiLuJe/koreader,mihailim/koreader,Markismus/koreader