* clutter/cogl/cogl.h:
* clutter/cogl/gl/cogl.c:
* clutter/cogl/gles/cogl.c:
Disable the depth test and buffer as has some strange side
effects, mainly on x/y axis rotation with multiple layers at
same depth (eg rotating text on a bg has very strange
effect). Seems no clean 100% effective way to fix without other
odd issues.. So for now move to application to handle and add
cogl_enable_depth_test() as for custom actors (i.e groups) to
enable if need be.
d83442476f