docs: add release notes for 20.1.7

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6573>

diff --git a/docs/relnotes/20.1.7.rst b/docs/relnotes/20.1.7.rst
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+Mesa 20.1.7 Release Notes / 2020-09-02
+======================================
+
+Mesa 20.1.7 is a bug fix release which fixes bugs found since the 20.1.6 release.
+
+Mesa 20.1.7 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 20.1.7 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
+---------------
+
+::
+
+    4de9dd0cb2ca367606cada421db62fbf6d276dfd533e522bfab6001ff9aba288  mesa-20.1.7.tar.xz
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- Road Redemption certain  graphic effects rendered white color
+- Intel Vulkan driver crash with alpha-to-coverage
+- error: ‘static_assert’ was not declared in this scope
+- vulkan/wsi/x11: deadlock with Xwayland when compositor holds multiple buffers
+- [RADV/ACO] Death Stranding cause a GPU hung (*ERROR* Waiting for fences timed out!)
+- lp_bld_init.c:172:7: error: implicit declaration of function ‘LLVMAddConstantPropagationPass’; did you mean ‘LLVMAddCorrelatedValuePropagationPass’? [-Werror=implicit-function-declaration]
+- radv: blitting 3D images with linear filter
+- <<MESA crashed>> Array Index Out of Range with Graphicsfuzz application
+- Intel Vulkan driver assertion with small xfb buffer
+
+
+Changes
+-------
+
+Alejandro Piñeiro (2):
+
+- v3d/packet: fix typo on Set InstanceID/PrimitiveID packet
+- v3d: set instance id to 0 at start of tile
+
+Alyssa Rosenzweig (6):
+
+- panfrost: Fix blend leak for render targets 5-8
+- panfrost: Free hash_to_temp map
+- pan/mdg: Free previous liveness
+- panfrost: Use memctx for sysvals
+- panfrost: Free batch->dependencies
+- pan/mdg: Fix perspective combination
+
+Bas Nieuwenhuizen (1):
+
+- radv: Fix 3d blits.
+
+Danylo Piliaiev (3):
+
+- glsl: Eliminate out-of-bounds triop_vector_insert
+- ir_constant: Return zero on out-of-bounds vector accesses
+- glsl: Eliminate assigments to out-of-bounds elements of vector
+
+Emil Velikov (1):
+
+- radv: restrict exported symbols with static llvm
+
+Eric Engestrom (11):
+
+- docs/relnotes: add sha256 sums to 20.1.6
+- .pick_status.json: Update to e94c22429b64f419d9a66f04fa5ecdad33f7f5ef
+- .pick_status.json: Mark 9146f596ed1e8854a2a6c9137396a902bc92946c as denominated
+- .pick_status.json: Mark da6d0e3facfe0eb5c7db2d75d6992643d929caff as denominated
+- .pick_status.json: Mark b5558f2d2aa738d90b9e039144ae3ca69bdf92ca as denominated
+- .pick_status.json: Mark c9858fb941ce7e903f608e537b3657c946f86980 as denominated
+- .pick_status.json: Mark ee77951714ff4373261befde6e84f592cc1c769c as denominated
+- .pick_status.json: Mark 7c226116c6c0793d6d9a7dec52ac7cf54b82b57f as denominated
+- .pick_status.json: Mark d7d7687829875e401690219d4a72458fb2bbe4de as denominated
+- scons: bump c++ standard to 14 to match meson
+- docs: add release notes for 20.1.7
+
+Jason Ekstrand (5):
+
+- clover/spirv: Don't call llvm::regularizeLlvmForSpirv
+- intel/nir: Pass the nir_builder by reference in lower_alpha_to_coverage
+- nir: Add a nir_metadata_all enum value
+- intel/nir: Rewrite the guts of lower_alpha_to_coverage
+- intel/fs: Fix MOV_INDIRECT and BROADCAST of Q types on Gen11+
+
+Jonathan Gray (11):
+
+- util: unbreak endian detection on OpenBSD
+- util/anon_file: add OpenBSD shm_mkstemp() path
+- meson: build with _ISOC11_SOURCE on OpenBSD
+- meson: conditionally include -ldl in gbm pkg-config file
+- util: futex fixes for OpenBSD
+- util/u_thread: include pthread_np.h if found
+- anv: use os_get_total_physical_memory()
+- util/os_misc: add os_get_available_system_memory()
+- anv: use os_get_available_system_memory()
+- util/os_misc: os_get_available_system_memory() for OpenBSD
+- vulkan: make VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT conditional
+
+Lionel Landwerlin (3):
+
+- anv: fix transform feedback surface size
+- intel/perf: store query symbol name
+- intel/perf: fix raw query kernel metric selection
+
+Marek Olšák (3):
+
+- st/mesa: don't generate NIR for ARB_vp/fp if NIR is not preferred
+- radeonsi: fix tess levels coming as scalar arrays from SPIR-V
+- gallivm: fix build on LLVM 12 due to LLVMAddConstantPropagationPass removal
+
+Marek Vasut (2):
+
+- etnaviv: Remove etna_resource_get_status()
+- etnaviv: Add lock around pending_ctx
+
+Nanley Chery (1):
+
+- gallium/dri2: Report correct YUYV and UYVY plane count
+
+Pierre Moreau (1):
+
+- clover/spirv: Remove unused tuple header
+
+Pierre-Eric Pelloux-Prayer (5):
+
+- mesa/st: introduce PIPE_CAP_NO_CLIP_ON_COPY_TEX
+- radeonsi: enable PIPE_CAP_NO_CLIP_ON_COPY_TEX
+- ac/llvm: add option to clamp division by zero
+- radeonsi,driconf: add clamp_div_by_zero option
+- radeonsi: use radeonsi_clamp_div_by_zero for SPECviewperf13, Road Redemption
+
+Rhys Perry (1):
+
+- aco: fix non-rtz pack_half_2x16
+
+Rob Clark (1):
+
+- freedreno: handle case of shadowing current render target
+
+Roman Gilg (2):
+
+- vulkan/wsi/x11: add sent image counter
+- vulkan/wsi/x11: wait for acquirable images in FIFO mode
+
+Samuel Pitoiset (1):
+
+- nir/algebraic: mark some optimizations with fsat(NaN) as inexact
+
+Vinson Lee (1):
+
+- vulkan: Fix memory leaks.