[chore] CMake kpvcrlib convert remaining tabs to four spaces (#877)
[chore] CMake kpvcrlib convert remaining tabs to four spaces (#877)

Cf. #871.
Frenzie/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,Frenzie/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,houqp/koreader-base,houqp/koreader-base,NiLuJe/koreader-base,houqp/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,koreader/koreader-base,houqp/koreader-base