docs: Add Vulkan to features.txt

To get the extension list:

$ git grep -hE "extension name=\"VK_KHR" src/vulkan/registry/vk.xml | \
  grep -v disabled | awk '{print $2}' | sed -E 's/(name=)?"//g' | sort

To find anv(il) and radv supported extensions:

$ git grep -hE "'VK_([A-Z]+)_[a-z]" src/intel/

$ git grep -hE "'VK_([A-Z]+)_[a-z]" src/amd/

v2:
 * Add radv to Vulkan 1.0 list (Bas)
 * 'started' => 'in progress'
 * Drop KHX and EXT extensions (Jason)

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

docs/features.txt

@@ -339,6 +339,47 @@ we DO NOT WANT implementations of these extensions for Mesa.
   GL_ARB_shadow_ambient                                 Superseded by GL_ARB_fragment_program
   GL_ARB_vertex_blend                                   Superseded by GL_ARB_vertex_program
 
+Vulkan 1.0 -- all DONE: anv, radv
+
+Khronos extensions that are not part of any Vulkan version:
+  VK_KHR_16bit_storage                                  in progress (Alejandro)
+  VK_KHR_android_surface                                not started
+  VK_KHR_dedicated_allocation                           DONE (anv, radv)
+  VK_KHR_descriptor_update_template                     DONE (anv, radv)
+  VK_KHR_display                                        not started
+  VK_KHR_display_swapchain                              not started
+  VK_KHR_external_fence                                 not started
+  VK_KHR_external_fence_capabilities                    not started
+  VK_KHR_external_fence_fd                              not started
+  VK_KHR_external_fence_win32                           not started
+  VK_KHR_external_memory                                DONE (anv, radv)
+  VK_KHR_external_memory_capabilities                   DONE (anv, radv)
+  VK_KHR_external_memory_fd                             DONE (anv, radv)
+  VK_KHR_external_memory_win32                          not started
+  VK_KHR_external_semaphore                             DONE (radv)
+  VK_KHR_external_semaphore_capabilities                DONE (radv)
+  VK_KHR_external_semaphore_fd                          DONE (radv)
+  VK_KHR_external_semaphore_win32                       not started
+  VK_KHR_get_memory_requirements2                       DONE (anv, radv)
+  VK_KHR_get_physical_device_properties2                DONE (anv, radv)
+  VK_KHR_get_surface_capabilities2                      DONE (anv)
+  VK_KHR_incremental_present                            DONE (anv, radv)
+  VK_KHR_maintenance1                                   DONE (anv, radv)
+  VK_KHR_mir_surface                                    not started
+  VK_KHR_push_descriptor                                DONE (anv, radv)
+  VK_KHR_sampler_mirror_clamp_to_edge                   DONE (anv, radv)
+  VK_KHR_shader_draw_parameters                         DONE (anv, radv)
+  VK_KHR_shared_presentable_image                       not started
+  VK_KHR_storage_buffer_storage_class                   DONE (anv, radv)
+  VK_KHR_surface                                        DONE (anv, radv)
+  VK_KHR_swapchain                                      DONE (anv, radv)
+  VK_KHR_variable_pointers                              DONE (anv, radv)
+  VK_KHR_wayland_surface                                DONE (anv, radv)
+  VK_KHR_win32_keyed_mutex                              not started
+  VK_KHR_win32_surface                                  not started
+  VK_KHR_xcb_surface                                    DONE (anv, radv)
+  VK_KHR_xlib_surface                                   DONE (anv, radv)
+
 
 A graphical representation of this information can be found at
 https://mesamatrix.net/