QLocale: Un-inline QString& constructor

Because it's BiC.
From the API review.

Pick-to: 6.3
Change-Id: I69f1fe58428241a876ae9058e8a0108a8e496c22
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/text/qlocale.cpp

@@ -1022,9 +1022,9 @@ QLocale::QLocale(QStringView name)
 
 #if QT_STRINGVIEW_LEVEL < 2
 /*!
-    \fn QLocale::QLocale(const QString &name)
     \overload
 */
+QLocale::QLocale(const QString &name) : QLocale(qToStringViewIgnoringNull(name)) {}
 #endif
 
 /*!

src/corelib/text/qlocale.h

@@ -928,7 +928,7 @@ public:
 
     QLocale();
 #if QT_STRINGVIEW_LEVEL < 2
-    explicit QLocale(const QString &name) : QLocale(qToStringViewIgnoringNull(name)) {}
+    explicit QLocale(const QString &name);
 #endif
     explicit QLocale(QStringView name);
     QLocale(Language language, Territory territory);