QMessageBox: cut out the _q_requireVersion() middle-man

Just de-inline the original function instead of merely moving its
implementation into an out-of-line function.

Amends 408fbd3f2d.

Pick-to: 6.6
Change-Id: I6860a10e0a7d876ce1837f196b1fb4165779540a
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

src/widgets/dialogs/qmessagebox.cpp

@@ -2847,7 +2847,7 @@ void QMessageBoxPrivate::helperDone(QDialog::DialogCode code, QPlatformDialogHel
         clickedButton = button;
 }
 
-Q_WIDGETS_EXPORT void _q_requireVersion(int argc, char *argv[], QAnyStringView req)
+void qRequireVersion(int argc, char *argv[], QAnyStringView req)
 {
     const auto required = QVersionNumber::fromString(req).normalized();
     const auto current = QVersionNumber::fromString(qVersion()).normalized();

src/widgets/dialogs/qmessagebox.h

@@ -312,12 +312,7 @@ private:
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(QMessageBox::StandardButtons)
 
-[[maybe_unused]]
-static inline void qRequireVersion(int argc, char *argv[], QAnyStringView req)
-{
-    Q_WIDGETS_EXPORT void _q_requireVersion(int, char *[], QAnyStringView);
-    _q_requireVersion(argc, argv, req);
-}
+Q_WIDGETS_EXPORT void qRequireVersion(int argc, char *argv[], QAnyStringView req);
 
 #define QT_REQUIRE_VERSION(argc, argv, str) qRequireVersion(argc, argv, str);