[Nouveau] mesa: Patch that fix/add missing WAIT_RING calls

[Michel Hermier]

Hi,
While trying to run a 3D app I needed to modify/add some WAIT_RING
calls so the push buffer is properly checked, before we try to blindly
push to it (sine OUT_RING don't perform this checks yet, I have a
small patch for that for libdrm).
I allready discussed about it with lynxeye and shining on IRC.
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