BUG: added patch for qt compilation on macos, see https://wiki.qt.io/Qt_5.9.5_Known_Issues

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)));
+ }