xbmc: add `zlib` to `DEPENDS`
XBMC depends on `zlib` [1] which is indirectly provided by other dependencies like `ffmpeg.inc` [2]. Add `zlib` to `DEPENDS` to avoid possible future breakage.
[1] http://trac.xbmc.org/browser/trunk/README.linux?rev=35279#L54
[2] http://cgit.openembedded.org/cgit.cgi/openembedded/tree/recipes/ffmpeg/ffmpeg.inc?h=org.openembedded.dev&id=
5316c5b1416391f15277ce867489e525b7eccd6e#n12
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Khem Raj <raj.khem@gmail.com>