bump crengine: fix loading some EPUB files (#1391)
bump crengine: fix loading some EPUB files (#1391)

Includes:
- Regex search: fix potential pattern cache bug
- XML file detection: ignore BOM
NiLuJe/koreader-base,NiLuJe/koreader-base,koreader/koreader-base,koreader/koreader-base,koreader/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,koreader/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base