i915: Disable the depth test whenever we don't have a depth buffer.
We were disabling it once at the moment we changed draw buffers, but later enabling of depth test could turn it back on. Fixes fbo-nodepth-test. Note that ctx->DrawBuffer has to be checked because during context create we get called while it's still unset. However, we know we'll get an intel_draw_buffer() after that, so it's safe to make a silly choice at this point. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30080
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