sync code with last improvements from OpenBSD

lib/mesa/docs/relnotes/20.2.6.rst

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+Mesa 20.2.6 Release Notes / 2020-12-16
+======================================
+
+Mesa 20.2.6 is a an emergency bug fix release for the 20.2 series
+
+Mesa 20.2.6 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 20.2.6 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
+---------------
+
+::
+
+    f12ca3c6c622f11cd79ad66b4220f04514fa96f795062fe92a37339ab19885db  mesa-20.2.6.tar.xz
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- None
+
+
+Changes
+-------
+
+Daniel Schürmann (1):
+
+- aco/spill: only prevent rematerializable vars from being DCE'd if they haven't been renamed
+
+Dylan Baker (2):
+
+- docs: add sha256 sums for 20.2.5
+- .pick_status.json: Update to 2d78e28ba702d366becabb8e241b861e6711c76e