fix nowarn

Author: dibarbet

eng/Build.props

@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <!-- This is a servicing branch, do not warn about outdated SDKs. -->
+    <NoWarn>$(NoWarn);NETSDK1138</NoWarn>
+  </PropertyGroup>
   <ItemGroup>
     <!-- Note: It is important BuildAnalyzers.sln builds first and does not allow building in parallel.
          Because projects in Razor.sln (or Razor.Slim.slnf) have a project reference to Razor.Diagnostics.Analyzers
@@ -12,8 +16,5 @@
 
     <!-- Exclude VSIX projects on non-Windows -->
     <ProjectToBuild Condition="'$(OS)'!='WINDOWS_NT' and '$(SdkTaskProjects)'==''" Include="$(MSBuildThisFileDirectory)..\Razor.Slim.slnf" />
-
-    <!-- This is a servicing branch, do not warn about outdated SDKs. -->
-    <NoWarn>$(NoWarn);NETSDK1138</NoWarn>
   </ItemGroup>
 </Project>