QT_NO_DRAGANDDROP conditional code in qtcolorbutton.cpp

When defining QT_NO_DRAGANDDROP in a Qt 4.6 build, qtcolorbutton.cpp will fail to compile because some code is not properly conditionalized. The private class QtColorButtonPrivate contains 3 variables, m_dragColor, m_dragStart, and m_dragging which are condtionalized in the class definition, but not at all access points within this file.

For example, m_dragging is not properly conditionalized in the QtColorButton constructor (line 123), which causes the compilation of this file to fail under these conditions.