Check for correct Windows SDK version when building ANGLE and DAWN

[bvisness]

Running the new orcadev build-angle from the webgpu-canvas branch gives me the following error on Windows.

**********************************************************************
** Visual Studio 2022 Developer Command Prompt v17.6.5
** Copyright (c) 2022 Microsoft Corporation
**********************************************************************
[vcvarsall.bat] Environment initialized for: 'x64'
>orcadev build-angle
Building Angle...
  * checking depot tools
  * checking angle
HEAD is now at 8a8c8fc28 Roll chromium_revision ad19957265..e506ce09ba (1165395:1165897)
Updating depot_tools...
created .gclient
Updating depot_tools...
Syncing projects: 100% (53/53), done.
Running hooks: 100% (20/20), done.                 
  * preparing build
Traceback (most recent call last):
  File "C:\Users\bvisn\Developer\handmade\orca\build\angle\build\toolchain\win\setup_toolchain.py", line 316, in <module>
    main()
  File "C:\Users\bvisn\Developer\handmade\orca\build\angle\build\toolchain\win\setup_toolchain.py", line 274, in main
    env = _LoadToolchainEnv(cpu, toolchain_root, win_sdk_path, target_store)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\bvisn\Developer\handmade\orca\build\angle\build\toolchain\win\setup_toolchain.py", line 190, in _LoadToolchainEnv
    return _ExtractImportantEnvironment(variables)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\bvisn\Developer\handmade\orca\build\angle\build\toolchain\win\setup_toolchain.py", line 68, in _ExtractImportantEnvironment
    raise Exception(
Exception: Path "C:\Program Files (x86)\Windows Kits\10\\include\10.0.22621.0\\um" from environment variable "include" does not exist. Make sure the necessary SDK is installed.
ERROR at //build/toolchain/win/win_toolchain_data.gni:9:7: Script returned non-zero exit code.
      exec_script("//build/toolchain/win/setup_toolchain.py",
      ^----------
Current dir: C:/Users/bvisn/Developer/handmade/orca/build/angle/out/Debug/
Command: C:/Users/bvisn/Developer/handmade/orca/build/depot_tools/bootstrap-2@3_11_6_chromium_30_bin/python3/bin/python3.exe C:/Users/bvisn/Developer/handmade/orca/build/angle/build/toolchain/win/setup_toolchain.py "C:\Program Files/Microsoft Visual Studio/2022/Community" "C:\Program Files (x86)\Windows Kits\10" "C:\Windows\System32;C:\Windows\SysWOW64;Arm64Unused" win x86 environment.x86
Returned 1.
See //build/toolchain/win/toolchain.gni:14:1: whence it was imported.
import("//build/toolchain/win/win_toolchain_data.gni")
^----------------------------------------------------
See //build/toolchain/win/BUILD.gn:6:1: whence it was imported.
import("//build/toolchain/win/toolchain.gni")
^-------------------------------------------
See //BUILD.gn:348:3: which caused the file to be included.
  copy("copy_compiler_dll") {
  ^--------------------------

Task failed with 1 error:
ERROR: The following command failed with code 1:
gn gen out/Debug --args=angle_build_all=false angle_build_tests=false is_debug=true is_component_build=false angle_enable_d3d9=false angle_enable_gl=false angle_enable_vulkan=false angle_enable_null=false angle_has_frame_capture=false        

[martinfouilleul]

Do you have the windows 10 sdk, and which version?
We should look at how they choose which SDK version to use, and detect here beforehand to display a better error if it doesn't exist.

[martinfouilleul]

the required Windows SDK version is located in vs_toolchain.py in the Angle repo.