Simplistic implementation. Also, make sure lines are written atomically
to not get garbled logs.
Signed-off-by: Hans-Kristian Arntzen <post@arntzen-software.no>
vkd3d-shader is currently kinda buggy and crashes when you try to trace
DXBC. This used to never be run since it was guarded by
VKD3D_SHADER_DEBUG, but with the move to a static build we merged all
debug logging under VKD3D_DEBUG. Reintroduce different debug channels in
a way that is compatible with a statically linked vkd3d.
Signed-off-by: Hans-Kristian Arntzen <post@arntzen-software.no>