The library template shall not us QT_STATIC and QT_DLL

Depending on the selection "Create Static Library (.lib)", the "ConfigurationType" is set as .lib or .dll, but in both cases a project_global.h is created. This makes only sense the case of a dll.

The define "QT_STATIC" which is Qt-internal should be used only for the build of Qt itself.

The "QT_DLL" preprocessor definition is added, which should no longer be used.