avoid warning message for deprecated function

/home/kunyi/Allwinner/YFEL/src/lib/QHexView/QHexView.cpp: In constructor ‘QHexView::QHexView(QWidget*)’:
/home/kunyi/Allwinner/YFEL/src/lib/QHexView/QHexView.cpp:29:38: warning: ‘int QFontMetrics::width(QChar) const’ is deprecated: Use QFontMetrics::horizontalAdvance [-Wdeprecated-declarations]
   29 |     m_charWidth = fontMetrics().width(QLatin1Char('9'));
      |                   ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
In file included from /usr/include/x86_64-linux-gnu/qt5/QtWidgets/qwidget.h:50,
                 from /usr/include/x86_64-linux-gnu/qt5/QtWidgets/qframe.h:44,
                 from /usr/include/x86_64-linux-gnu/qt5/QtWidgets/qabstractscrollarea.h:44,
                 from /usr/include/x86_64-linux-gnu/qt5/QtWidgets/QAbstractScrollArea:1,
                 from /home/kunyi/Allwinner/YFEL/src/lib/QHexView/QHexView.h:4,
                 from /home/kunyi/Allwinner/YFEL/src/lib/QHexView/QHexView.cpp:1:
/usr/include/x86_64-linux-gnu/qt5/QtGui/qfontmetrics.h:110:9: note: declared here
  110 |     int width(QChar) const;

src/lib/QHexView/QHexView.cpp

@@ -23,7 +23,7 @@ QHexView::QHexView(QWidget *parent) :
         m_pdata(NULL) {
     setFont(QFont("Courier", 10));
 
-#if QT_VERSION >= 0x051100
+#if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
     m_charWidth = fontMetrics().horizontalAdvance(QLatin1Char('9'));
 #else
     m_charWidth = fontMetrics().width(QLatin1Char('9'));
@@ -100,7 +100,7 @@ QSize QHexView::fullSize() const {
 }
 
 void QHexView::updatePositions() {
-#if QT_VERSION >= 0x051100
+#if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
     m_charWidth = fontMetrics().horizontalAdvance(QLatin1Char('9'));
 #else
     m_charWidth = fontMetrics().width(QLatin1Char('9'));
@@ -532,4 +532,4 @@ QByteArray QHexView::DataStorageFile::getData(std::size_t position, std::size_t
 
 std::size_t QHexView::DataStorageFile::size() {
     return m_file.size();
-}
+}