Clean up configure script a bit
Clean up configure script a bit

rhult/ige-mac-integration,GNOME/gtk-mac-integration,GNOME/gtk-mac-integration,sharoonthomas/gtk-mac-integration,jralls/gtk-mac-integration,jralls/gtk-mac-integration,jralls/gtk-mac-integration,sharoonthomas/gtk-mac-integration,rhult/ige-mac-integration,GNOME/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,rhult/ige-mac-integration