Stop psm1 processing empty Private dir to resolve build issue

Author: DanGough

src/PSAppDeployToolkit.Tools/PSAppDeployToolkit.Tools.psm1

@@ -10,7 +10,8 @@
 # Dot-source our imports.
 if (!$Module.Compiled)
 {
-    & $CommandTable.'New-Variable' -Name ModuleFiles -Option Constant -Value ([System.IO.FileInfo[]]$([System.IO.Directory]::GetFiles("$PSScriptRoot\Private"); [System.IO.Directory]::GetFiles("$PSScriptRoot\Public")))
+    #& $CommandTable.'New-Variable' -Name ModuleFiles -Option Constant -Value ([System.IO.FileInfo[]]$([System.IO.Directory]::GetFiles("$PSScriptRoot\Private"); [System.IO.Directory]::GetFiles("$PSScriptRoot\Public")))
+    & $CommandTable.'New-Variable' -Name ModuleFiles -Option Constant -Value ([System.IO.FileInfo[]]$([System.IO.Directory]::GetFiles("$PSScriptRoot\Public")))
     & $CommandTable.'New-Variable' -Name FunctionNames -Option Constant -Value ($ModuleFiles | & { process { return $_.BaseName } })
     & $CommandTable.'New-Variable' -Name FunctionPaths -Option Constant -Value ($FunctionNames -replace '^', 'Microsoft.PowerShell.Core\Function::')
     & $CommandTable.'Remove-Item' -LiteralPath $FunctionPaths -Force -ErrorAction Ignore