Merge pull request #716 from chrox/master

update koreader-base
Update koreader-base

PW2 & FFI stuff
Merge pull request #719 from NiLuJe/master

Update koreader-base
Update koreader-base

Fix Android build
Merge pull request #720 from NiLuJe/master

Update koreader-base
fix importing finite math from GLIBC_2.15
This should fix #722.