Add cmake

Author: matthew-brett

.github/workflows/windows-arm.yml

@@ -47,8 +47,9 @@ jobs:
         $llvmPath = "C:\Program Files\LLVM\bin"
         echo "$llvmPath" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
 
-    - name: Check where stuff is
+    - name: Update CMake for WoA
       run: |
+        pip install cmake
         get-command cmake
 
     - name: Build