Fixed compile error on Mac OS X Lion, missing include statement.

Also, don't try and build the quicktime/CG bits on QPA for now,
since that really doesn't seem to work.

Change-Id: If88b94bae3c092f2480318fa169250c03de44784
Reviewed-on: http://codereview.qt.nokia.com/2545
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>

src/multimediakit/multimediakit.pro

@@ -160,7 +160,7 @@ include(audio/audio.pri)
 include(video/video.pri)
 include(effects/effects.pri)
 
-mac {
+mac:!qpa {
 !simulator {
    HEADERS += qpaintervideosurface_mac_p.h
    OBJECTIVE_SOURCES += qpaintervideosurface_mac.mm