Vladyslav Turchynevych

update xcode environment schema

2

Rationale: if I'm using environment variables from the [official tutorial](https://docs.vulkan.org/tutorial/latest/02_Development_environment.html#_setting_up_xcode) in Xcode, the result is below. ``` required extensions: 1 VK_KHR_portability_enumeration available extensions: 4 VK_EXT_debug_report VK_EXT_debug_utils VK_KHR_portability_enumeration VK_LUNARG_direct_driver_loading -9 failed...