Adjust generation scripts to build using dotnet msbuild

Author: dougbu

eng/scripts/GenerateProjectList.ps1

@@ -4,6 +4,7 @@ param(
 $ErrorActionPreference = 'stop'
 
 $repoRoot = Resolve-Path "$PSScriptRoot/../.."
+$msbuildEngine = 'dotnet'
 
 & "$repoRoot\eng\common\msbuild.ps1" -ci:$ci "$repoRoot/eng/CodeGen.proj" `
     /t:GenerateProjectList `

eng/scripts/GenerateReferenceAssemblies.ps1

@@ -5,6 +5,9 @@ $ErrorActionPreference = 'stop'
 
 $repoRoot = Resolve-Path "$PSScriptRoot/../.."
 
+& "$repoRoot\build.ps1" -ci:$ci -buildNative
+
+$msbuildEngine = 'dotnet'
 & "$repoRoot\eng\common\msbuild.ps1" -ci:$ci "$repoRoot/eng/CodeGen.proj" `
     /t:GenerateReferenceSources `
     /bl:artifacts/log/genrefassemblies.binlog