Compile on Mac.
Compile on Mac.

Add Carbon include for HITheme. Revert some of the
WS_MAC -> OS_MAC renames pending a working implementation
of qt_mac_cg_context.

Change-Id: I7a4656d7a399942635209afd10acb4e12c4d718b
Reviewed-by: Morten Johan Sørvig <84fe11dd8bf63b99760f9a020e6b4a145681baec@nokia.com>

richardmg/qtcomponents,mizukusak/qtquickcontrols,jfaust/qtquickcontrols,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols,drgvond/qtquickcontrols,kobolabs/qtquickcontrols,jfaust/qtquickcontrols,kobolabs/qtquickcontrols,richardmg/qtcomponents,mizukusak/qtquickcontrols,jfaust/qtquickcontrols,drgvond/qtquickcontrols,richardmg/qtcomponents,drgvond/qtquickcontrols