Fix build with llvm-15
https://github.com/KDE/clazy/commit/20fca52da739ebefa47e35f6b338bb99a0da3cfe
Index: src/checks/manuallevel/qt6-fwd-fixes.h
--- src/checks/manuallevel/qt6-fwd-fixes.h.orig
+++ src/checks/manuallevel/qt6-fwd-fixes.h
@@ -47,7 +47,7 @@ class Qt6FwdFixes (public)
     explicit Qt6FwdFixes(const std::string &name, ClazyContext *context);
     void VisitDecl(clang::Decl *decl) override;
     void VisitInclusionDirective(clang::SourceLocation HashLoc, const clang::Token &IncludeTok, clang::StringRef FileName, bool IsAngled,
-                            clang::CharSourceRange FilenameRange, const clang::FileEntry *File, clang::StringRef SearchPath,
+                            clang::CharSourceRange FilenameRange, clazy::OptionalFileEntryRef File, clang::StringRef SearchPath,
                             clang::StringRef RelativePath, const clang::Module *Imported, clang::SrcMgr::CharacteristicKind FileType) override;
     bool m_including_qcontainerfwd = false;
     std::set<clang::StringRef> m_qcontainerfwd_included_in_files;