noop: make noop useable like trace or rbug

If you want to enable noop set GALLIUM_NOOP=1 as an env variable.
You need first to enable noop wrapping for your driver see change
to src/gallium/targets/dri-r600/ in this commit as an example.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
7 files changed