Merge pull request #2489 from Voyager1/fix_addoninstaller_np

fixed: addoninstaller unguarded null pointer after #2475
Only add to preDeps when it's not in there.
depends: fix sed in libgcrypt which wants to change the optimisation but also might change other stuff we don't want (e.x. XBMC-OSX to XBMC-O1SX :p)
Merge pull request #2488 from Voyager1/fix_discmenu_deadlock

[dvdplayer] fix deadlock when trying to go to disc menu
Very simple movie set management - allow set, change and clear