Adjusting test_windows step to work with intel-opencl-rt=2023.1.0

In CI, shell scripts are executed with elevated priviledges, hence
OpenCL loader ignores variable OCL_ICD_FILENAMES. One must set
a registry value. intel-opencl-rt comes with a script to do that.

It also comes with fixed cl.cfg file, so the step to modify cl.cfg
in situ is no longer needed, and in fact corrupts the file.

Author: oleksandr-pavlyk

.github/workflows/conda-package.yml

@@ -269,22 +269,10 @@ jobs:
       - name: Configure Intel OpenCL CPU RT
         shell: pwsh
         run: |
-          if (-not (Test-Path -Path HKLM:\SOFTWARE\Khronos)) {
-              New-Item -Path HKLM:\SOFTWARE\Khronos
-          }
-          if (-not (Test-Path -Path HKLM:\SOFTWARE\Khronos\OpenCL)) {
-              New-Item -Path HKLM:\SOFTWARE\Khronos\OpenCL
-          }
-          if (-not (Test-Path -Path HKLM:\SOFTWARE\Khronos\OpenCL\Vendors)) {
-              New-Item -Path HKLM:\SOFTWARE\Khronos\OpenCL\Vendors
-          }
-          $conda_env_library = "$env:CONDA_PREFIX\Library"
-          New-ItemProperty -Path HKLM:\SOFTWARE\Khronos\OpenCL\Vendors -Name $conda_env_library\lib\intelocl64.dll -Value 0
-          Write-Host $(Get-Item -Path HKLM:\SOFTWARE\Khronos\OpenCL\Vendors)
-          # Variable assisting OpenCL CPU driver to find TBB DLLs which are not located where it expects them by default
-          $cl_cfg="$conda_env_library\lib\cl.cfg"
-          Write-Output $cl_cfg
-          (Get-Content $cl_cfg) -replace '^CL_CONFIG_TBB_DLL_PATH =', "CL_CONFIG_TBB_DLL_PATH = $conda_env_library\bin" | Set-Content $cl_cfg
+          $script_path="$env:CONDA_PREFIX\Scripts\set-intel-ocl-icd-registry.ps1"
+          &$script_path
+          # Check the variable assisting OpenCL CPU driver to find TBB DLLs which are not located where it expects them by default
+          $cl_cfg="$env:CONDA_PREFIX\Library\lib\cl.cfg"
           Get-Content -Tail 5 -Path $cl_cfg
       - name: Smoke test, step 1
         shell: cmd /C CALL {0}