Explicitly provide MOC_DEFINES, use HAVE_SSL instead of QT_NO_OPENSSL. Should fix...

Explicitly provide MOC_DEFINES, use HAVE_SSL instead of QT_NO_OPENSSL. Should fix MacOSX compilation issues

This removes the automated DEFINITIONS recognition for MOC (which was not cross-platform apparently);
instead, we now explicitly set MOC_DEFINES for things where it matters, such as -DHAVE_DBUS and -DHAVE_SSL.