REFAC: remove the qfixed macos patch for QT5 (5.14.1 has the changes)

SuperBuild/patches/QT5/qt5-4-fix-qfixed-macx.diff

---- a/qtbase/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
-+++ b/qtbase/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
-@@ -824,7 +824,7 @@ void QCoreTextFontEngine::getUnscaledGlyph(glyph_t glyph, QPainterPath *path, gl
- 
- QFixed QCoreTextFontEngine::emSquareSize() const
- {
--    return QFixed::QFixed(int(CTFontGetUnitsPerEm(ctfont)));
-+    return QFixed(int(CTFontGetUnitsPerEm(ctfont)));
- }