osxvideosink: Fix last commit to actually work
osxvideosink: Fix last commit to actually work

MAC_OS_X_VERSION_10_6 is obviously not defined on 10.5.

freedesktop-unofficial-mirror/gstreamer-sdk__gst-plugins-good,freedesktop-unofficial-mirror/gstreamer-sdk__gst-plugins-good,freedesktop-unofficial-mirror/gstreamer-sdk__gst-plugins-good,freedesktop-unofficial-mirror/gstreamer-sdk__gst-plugins-good