Add check mode support for Windows modules that don't modify the remote system.

lib/ansible/modules/windows/slurp.ps1

@@ -17,7 +17,7 @@
 # WANT_JSON
 # POWERSHELL_COMMON
 
-$params = Parse-Args $args;
+$params = Parse-Args $args $true;
 
 $src = Get-Attr $params "src" (Get-Attr $params "path" $FALSE);
 If (-not $src)

lib/ansible/modules/windows/win_ping.ps1

@@ -17,7 +17,7 @@
 # WANT_JSON
 # POWERSHELL_COMMON
 
-$params = Parse-Args $args;
+$params = Parse-Args $args $true;
 
 $data = Get-Attr $params "data" "pong";
 

lib/ansible/modules/windows/win_stat.ps1

@@ -17,7 +17,7 @@
 # WANT_JSON
 # POWERSHELL_COMMON
 
-$params = Parse-Args $args;
+$params = Parse-Args $args $true;
 
 function Date_To_Timestamp($start_date, $end_date)
 {