BUILD: Disable parallel build

The build agents can't handle the size of our PCH files.

Signed-off-by: Dustin Howett <duhowett@microsoft.com>

build/pipelines/templates/build-console-steps.yml

@@ -41,7 +41,9 @@ steps:
     configuration: '$(BuildConfiguration)'
     msbuildArgs: "${{ parameters.additionalBuildArguments }}"
     clean: true
-    maximumCpuCount: true
+    # The build agents cannot currently support parallel build due to the
+    # memory requirements of our PCH files.
+    maximumCpuCount: false
 
 - task: PowerShell@2
   displayName: 'Check MSIX for common regressions'