QLocaleData: move CharBuff typedef out of QLocaleData

It'll be used by another struct in a subsequent commit.

Change-Id: Ia94c6ae3506f9ba6cba6b71a5839bff8b3a2ab1f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/text/qlocale_p.h

@@ -211,6 +211,9 @@ struct QLocaleId
 };
 Q_DECLARE_TYPEINFO(QLocaleId, Q_PRIMITIVE_TYPE);
 
+
+using CharBuff = QVarLengthArray<char, 256>;
+
 struct QLocaleData
 {
 public:
@@ -244,8 +247,6 @@ public:
 
     enum NumberMode { IntegerMode, DoubleStandardMode, DoubleScientificMode };
 
-    typedef QVarLengthArray<char, 256> CharBuff;
-
 private:
     enum PrecisionMode {
         PMDecimalDigits =       0x01,