Where the two upstream libraries in this folder came from.

scintilla/    Scintilla 567 (5.6.7) — the official release
              https://www.scintilla.org/scintilla567.zip

lexilla/      Lexilla 554 (5.5.4) — the official release
              https://www.scintilla.org/lexilla554.zip
              https://github.com/ScintillaOrg/lexilla.git  tag rel-5-5-4
              (Lexilla is versioned separately from Scintilla and does
              not track it)

Both are unmodified. Nothing in LinuxNoteText edits them: the one thing
Scintilla needs that Qt 6 no longer has — QTextCodec — is supplied by
native/SciCodec.cpp through a header of that name on the include path, so
updating either library is a matter of replacing the folder and running
./build.sh again.
