configure.ac: Remove unused HAVE_PIPE_LOADER_XLIB macro.

Added in e1364530 but never used.

Tested-by: Tom Stellard <thomas.stellard@amd.com>
Tested-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
build: Rename PIPE_LOADER_HAVE_XCB to HAVE_PIPE_LOADER_XCB.

For consistency, since we already have HAVE_PIPE_LOADER_{SW,DRM}.

Tested-by: Tom Stellard <thomas.stellard@amd.com>
Tested-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
build: Remove libws_null.la from GALLIUM_PIPE_LOADER_LIBS.

Tested-by: Tom Stellard <thomas.stellard@amd.com>
Tested-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
build: Remove HAVE_PIPE_LOADER_SW.

It guarded the function prototype of pipe_loader_sw_probe, whose use (in
pipe_loader.c) and definition (in pipe_loader_sw.c) were not guarded.
Both are built into libpipe_loader.la if HAVE_LOADER_GALLIUM, which is
enable_gallium_loader in configure.ac.

Tested-by: Tom Stellard <thomas.stellard@amd.com>
Tested-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
build: Remove libpipe_loader.la from GALLIUM_PIPE_LOADER_LIBS.

Tested-by: Tom Stellard <thomas.stellard@amd.com>
Tested-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
build: Remove libws_xlib.la from GALLIUM_PIPE_LOADER_LIBS.

The three users of GALLIUM_PIPE_LOADER_LIBS (OpenCL, gallium-gbm,
gallium tests) don't appear to need libws_xlib.la.

Tested-by: Tom Stellard <thomas.stellard@amd.com>
Tested-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
docs: Import 9.1.2 release notes, add news item.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
!UPSTREAM: i965: Allocate MCS buffers for use by fast color clears.

TODO:

- get this to build.

- modify callers of gen7_wm_surface_state to set up the MCS buffer
  when present, even if not multisampling.

- write blorp code to do fast color clears

- write blorp code to do color resolves

- write code to ensure that color resolves happen when necessary

- write code to do fast rather than slow color clears when possible