libass: add 0.9.11

libass: add 0.9.11

The web site states the following [1].

	The following projects use libass:

	MPlayer
	VLC
	GStreamer (assrender plugin)
	Aegisub
	XBMC
	avidemux
	PunkGraphicsStream (BD subtitle encoder)

Build tested with 576df0d4 [2] with `angstrom-2008.1`, `angstrom-2010.x` and `minimal` for `MACHINE = `beagleboard`.

[1] http://code.google.com/p/libass/
[2] http://cgit.openembedded.org/cgit.cgi/openembedded/commit/?id=576df0d47658d195d7788ecaabdcb464a9b8f623

Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Khem Raj <raj.khem@gmail.com>