mplayer2: fix building with gcc 5.x

This patch works around a potential problem in the theora
glue code where it assumes that the compiler will
somehow find a function which is not exported explicitly
through the libtheora library. Due to this problem the
build fails with gcc-5.x compiler.
The included patch essentially backports a commit which
updates the glue code to use the Theora 1.0 API to
eliminate this problem and PNBLACKLIST is cleared
for mplayer2.

Signed-off-by: Awais Belal <awais_belal@mentor.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>