gallium,drivers: use API settings / rasterization rules

v2: compilation fixes by David Heidelberger <david.heidelberger@ixit.cz>
v3: compilation fix by Thermionix <bond711@gmail.com>
nv50,nvc0: handle TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION
nv50,nvc0: handle NULL vertex elements without fallback
nv50/ir/tgsi: implement TGSI_OPCODE_NRM,DP2A

Used by d3d9 st.
nv50: don't emit buffer for skipped vertex elements

Grr, should forbid that and insert dummy elements in nine.
nvc0: avoid fault in get_query_result if there was no begin_query
gallium,drivers: add PIPE_CAP_DEVICE_MEMORY_SIZE

Signed-off-by: David Heidelberger <david.heidelberger@ixit.cz>
winsys/sw/wrapper: hook up is_displaytarget_format_supported

Looks like no one's using this thing.
gallium/draw: support hack to disable clipping
nv50: support for hackish viewport bypass
nv50,nvc0: d3d9 requires transfer stride to be aligned to 4
gallium: add blending to pipe blit
nvc0: use blending to pipe blit
mesa/st: initialize blit.alpha_blend
nvc0: NULL vertex buffers are allowed
nv50/ir/tgsi: handle TGSI_OPCODE_CND
nvc0: reset constant vertex attribute data after blit

To make wine's test_vshader_input happy.
nvc0: SQUASH y-flip does affect FragCoord shader input after all
nvc0: add fast-path for constant buffer upload

Saves a memcpy, and increased threshold for push method, which is
usually better because there's no subchannel switch.
nvc0: don't update vbufs that aren't being accessed