opengl: remove the unused ViewMatrix
opengl: remove the unused ViewMatrix

The matrix is not used anywhere, and is unlikely to be used in the future; as
such these changes removes it (and its associated properties).

Signed-off-by: Thomas Guillem <5f50a84c1fa3bcff146405017f36aec1a10a9e38@gllm.fr>

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc