DocCache: Unbreak on !Linux platforms (#9566)
DocCache: Unbreak on !Linux platforms (#9566)

Regression since #9529
Fix #9565
poire-z/koreader,Frenzie/koreader,poire-z/koreader,NiLuJe/koreader,koreader/koreader,koreader/koreader,Frenzie/koreader,NiLuJe/koreader