Skip Service Center validation for first installs. (#157)

* Skip Service Center validation for first installs. Remove code that modify permissions, this should be something customers handle.

* add missing bracket

* Re-add Changing IIS compilation folder

Author: RicardoLucasM

src/Outsystems.SetupTools/Functions/Set-OSServerPerformanceTunning2.ps1

@@ -154,7 +154,7 @@ function Set-OSServerPerformanceTunning2
             return
         }
 
-        if ( $null -eq (Get-OSPlatformVersion -ErrorAction Ignore) ) {
+        if ($(-not $SkipPlatformCheck) -and ($null -eq (Get-OSPlatformVersion -ErrorAction Ignore))) {
 
             LogMessage -Function $($MyInvocation.Mycommand) -Phase 1 -Stream 3 -Message "Service Center is not installed or not accessible"
             WriteNonTerminalError -Message "Service Center is not installed or not accessible"
@@ -366,22 +366,6 @@ function Set-OSServerPerformanceTunning2
                 }
             }
 
-            # Grant Modify permissions on the directory to the local IIS_IUSRS group
-            try
-            {
-                $Path_ACL = Get-ACL -Path $IISNetCompilationPath
-                $Path_ACLRule = New-Object System.Security.AccessControl.FileSystemAccessRule("IIS_IUSRS","Modify","ContainerInherit, ObjectInherit","None","Allow")
-                $Path_ACL.SetAccessRule($Path_ACLRule)
-                Set-Acl -Path $IISNetCompilationPath -AclObject $Path_ACL
-            }
-            catch
-            {
-                LogMessage -Function $($MyInvocation.Mycommand) -Phase 1 -Exception $_.Exception -Stream 3 -Message "Error setting permissions on the IIS Net compilation folder"
-                WriteNonTerminalError -Message "Error setting permissions on the IIS Net compilation folder"
-
-                return
-            }
-
             LogMessage -Function $($MyInvocation.Mycommand) -Phase 1 -Stream 0 -Message "Changing IIS compilation folder to $IISNetCompilationPath"
             try
             {