docs: add release notes for 21.2.4

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+Mesa 21.2.4 Release Notes / 2021-10-14
+======================================
+
+Mesa 21.2.4 is a bug fix release which fixes bugs found since the 21.2.3 release.
+
+Mesa 21.2.4 implements the OpenGL 4.6 API, but the version reported by
+glGetString(GL_VERSION) or glGetIntegerv(GL_MAJOR_VERSION) /
+glGetIntegerv(GL_MINOR_VERSION) depends on the particular driver being used.
+Some drivers don't support all the features required in OpenGL 4.6. OpenGL
+4.6 is **only** available if requested at context creation.
+Compatibility contexts may report a lower version depending on each driver.
+
+Mesa 21.2.4 implements the Vulkan 1.2 API, but the version reported by
+the apiVersion property of the VkPhysicalDeviceProperties struct
+depends on the particular driver being used.
+
+SHA256 checksum
+---------------
+
+::
+
+    TBD.
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- RADV: Rendering issues in Resident Evil 2 with NGGC
+- crocus:  Incorrect stride when used through prime
+- anv: descriptorBindingUniformBufferUpdateAfterBind feature is not supported
+
+
+Changes
+-------
+
+Alyssa Rosenzweig (3):
+
+- panfrost: Move special_varying to compiler definitions
+- panfrost: Fix off-by-one in varying count assert
+- panfrost: Don't set CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER
+
+Bas Nieuwenhuizen (2):
+
+- amd/common: Add fallback for misreported clocks for RGP.
+- radv: Handle copying zero queries.
+
+Chia-I Wu (1):
+
+- radv: plug leaks in radv_device_init_accel_struct_build_state
+
+Connor Abbott (1):
+
+- ir3: Use source in ir3_output_conv_src_type()
+
+Dave Airlie (7):
+
+- crocus/query: don't loop on ready status after gpu hang.
+- device_select: close dri3 fd after using it.
+- crocus: Honor scanout requirement from DRI
+- crocus/gen5: reemit shaders on gen5 after new program cache bo.
+- crocus/gen5: add dirty flags for urb fences.
+- crocus/gen6: don't reemit the svbi when debugging
+- gallivm/format: clamp SINT conversion rather than truncate.
+
+Dylan Baker (7):
+
+- docs" Add SHA256 sum for mesa 21.2.3
+- .pick_status.json: Update to fb8f532ea1bbd9c959e0f59c652347e435a71f91
+- .pick_status.json: Update to d2543658ef6fe0ad59af217a09a931d3b6174a43
+- .pick_status.json: Update to 729991e09cd28550001ae63710ab929d95b115bc
+- .pick_status.json: Update to 3a18963b0876af2aa0d60dd9917e69d409ce4d6e
+- .pick_status.json: Update to ced950e42f4a95ef410e63c2d26a2119e0c3c40b
+- .pick_status.json: Update to 783f8f728ce8e77885adbc7b2c12c39c3e3e5198
+
+Emma Anholt (2):
+
+- gallium/dri: Make YUV formats we're going to emulate external-only.
+- i915g: Check for the scanout-layout conditions before setting level info.
+
+Filip Gawin (1):
+
+- r300: implement forgotten tgsi's cases of textures
+
+Gert Wollny (1):
+
+- mesa: signal driver when buffer is bound to different texture format
+
+Icecream95 (1):
+
+- pan/mdg: Use the correct swizzle for condition moves
+
+Jason Ekstrand (1):
+
+- vulkan/shader_module: Fix the lifetime of temporary shader modules
+
+Kai Wasserbäch (2):
+
+- gallivm: add new wrapper around Module::setOverrideStackAlignment()
+- gallivm: fix FTBFS on i386 with LLVM >= 13, StackAlignmentOverride is gone
+
+Lionel Landwerlin (3):
+
+- anv: enable UBO indexing
+- anv: add missing transition handling bits
+- spirv: deal with null pointers
+
+Marek Olšák (2):
+
+- radeonsi: add back a workaround for DCC MSAA on gfx9 due to conformance issues
+- ac/surface: don't overwrite DCC settings for imported buffers
+
+Pavel Asyutchenko (1):
+
+- llvmpipe: fix crash when doing FB fetch + gl_FragDepth write in one shader
+
+Qiang Yu (1):
+
+- loader/dri3: fix swap out of order when changing swap interval
+
+Rob Clark (1):
+
+- freedreno/drm: Move pipe unref after fence removal
+
+Samuel Pitoiset (2):
+
+- radv: fix adjusting the frag coord when RADV_FORCE_VRS is enabled
+- aco: fix load_barycentric_at_{offset,sample}
+
+Timur Kristóf (3):
+
+- aco: Fix small primitive precision.
+- aco: Fix determining whether any culling is enabled.
+- ac/nir/cull: Accept NaN and +/- Inf in face culling.
+
+Vasily Khoruzhick (1):
+
+- lima: split_load_input: don't split unaligned vec2
+
+Vinson Lee (1):
+
+- pps: Avoid duplicate elements in with_datasources array.