Don't include LICENSE.TXT in nuget packages (#115518)

Runtime nuget packages already define a PackageLicenseExpression=MIT

There's no need to also bundle the LICENSE file into the packages as the nuspec correctly points to the license site.

Author: ViktorHofer

Directory.Build.targets

@@ -84,11 +84,6 @@
 
   <!-- Packaging -->
   <ItemGroup Condition="'$(IsPackable)' == 'true'">
-    <!-- The sfxproj files add the license themselves. -->
-    <None Include="$(LicenseFile)"
-          PackagePath="$([System.IO.Path]::GetFileName('$(LicenseFile)'))"
-          Pack="true"
-          Condition="'$(MSBuildProjectExtension)' != '.sfxproj' and '$(MSBuildProjectFile)' != 'msi.csproj'" />
     <None Include="$(PackageThirdPartyNoticesFile)"
           PackagePath="$([System.IO.Path]::GetFileName('$(PackageThirdPartyNoticesFile)'))"
           Pack="true" />