Fix Linux build after removing LoadAudioUnits.*.

Didn't even cross my mind to have to worry about it..but it makes sense.



git-svn-id: http://audacity.googlecode.com/svn/audacity-src/trunk@13650 47890b92-0858-11df-a26f-8b716316a5bc
Paul L's patch to remove the 'PlaybackCursor' that he introduced, along with a ststus bar message about it.  Also fixes L/R cursors with a point selection.

git-svn-id: http://audacity.googlecode.com/svn/audacity-src/trunk@13651 47890b92-0858-11df-a26f-8b716316a5bc