message: Add support for some extensions that can just be pass-through
  * VK_EXT_shader_stencil_export and VK_EXT_shader_viewport_index_layer are
  shader-only extensions that don't affect the postvs code.
  * VK_EXT_depth_range_unrestricted lifts a restriction that we don't care about.
diff: @@ -605,6 +605,9 @@ static const VkExtensionProperties supportedExtensions[] = {
  {
  VK_EXT_DEBUG_UTILS_EXTENSION_NAME, VK_EXT_DEBUG_UTILS_SPEC_VERSION,
  },
  + {
  + VK_EXT_DEPTH_RANGE_UNRESTRICTED_EXTENSION_NAME, VK_EXT_DEPTH_RANGE_UNRESTRICTED_SPEC_VERSION,
  + },
  {
  VK_EXT_DIRECT_MODE_DISPLAY_EXTENSION_NAME, VK_EXT_DIRECT_MODE_DISPLAY_SPEC_VERSION,
  },
  @@ -620,12 +623,19 @@ static const VkExtensionProperties supportedExtensions[] = {
  {
  VK_EXT_SAMPLER_FILTER_MINMAX_EXTENSION_NAME, VK_EXT_SAMPLER_FILTER_MINMAX_SPEC_VERSION,
  },
  + {
  + VK_EXT_SHADER_STENCIL_EXPORT_EXTENSION_NAME, VK_EXT_SHADER_STENCIL_EXPORT_SPEC_VERSION,
  + },
  {
  VK_EXT_SHADER_SUBGROUP_BALLOT_EXTENSION_NAME, VK_EXT_SHADER_SUBGROUP_BALLOT_SPEC_VERSION,
  },
  {
  VK_EXT_SHADER_SUBGROUP_VOTE_EXTENSION_NAME, VK_EXT_SHADER_SUBGROUP_BALLOT_SPEC_VERSION,
  },
  + {
  + VK_EXT_SHADER_VIEWPORT_INDEX_LAYER_EXTENSION_NAME,
  + VK_EXT_SHADER_VIEWPORT_INDEX_LAYER_SPEC_VERSION,
  + },
  {
  VK_EXT_VALIDATION_FLAGS_EXTENSION_NAME, VK_EXT_VALIDATION_FLAGS_SPEC_VERSION,
  },
  