Generate Makefiles instead of Xcode projects on macOS

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If you call qmake of the prebuilt binaries of Qt, it produces XCode project files (xxx.xcodeproj) instead of make files. You can create regular make files with this commands:

rm -rf hello.xcodeporj
rm Info.plist
 
qmake -spec macx-g++

If you want to create make files per default, you can tell qmake by executing the following commands

cd $QTDIR/mkspecs
rm default

ln -s macx-g++ default