bump crengine: various fixes and optimizations

[poire-z]

bump crengine: various fixes and optimizations

Includes:

• xml parser: simplifications and optimizations https://github.com/koreader/crengine/pull/567
• lvstring: optimize Utf8ToUnicode https://github.com/koreader/crengine/pull/571
• https://github.com/koreader/crengine/pull/572 :
  • lvstream: add helper to read the whole stream
  • lvfntman: use new LVStream::GetData helper
  • EPUB: minor simplification
  • EPUB: fix possible buffer overflows
  • EPUB: improve support for obfuscated fonts
• lvfntman: add error traces for some freetype calls https://github.com/koreader/crengine/pull/573
• LVDocView header: allow displaying author and book title separately https://github.com/koreader/crengine/pull/575
• https://github.com/koreader/crengine/pull/578 :
  • LVFontDef::CalcMatch(): bump weight of typeface match
  • Font: fix measureText() when max_width met with fallback font
• TextLang: Russian: loosen curly quotes handling https://github.com/koreader/crengine/pull/577

cre.cpp: isLinkToFootnote: say no if target has empty content

Frontend code would not display the footnote popup if the footnote content fetched is empty, leaving the link highlighted and the user confused. See https://github.com/koreader/koreader/issues/12102#issuecomment-2192491660. Should allow closing https://github.com/koreader/koreader/issues/12102.

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