Remove versioning/t4.targets from VSIX project

Author: jcansdale

src/GitHub.VisualStudio.Vsix/GitHub.VisualStudio.Vsix.csproj

@@ -343,9 +343,6 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="$(VSToolsPath)\VSSDK\Microsoft.VsSDK.targets" Condition="'$(VSToolsPath)' != '' And '$(NCrunch)' != '1'" />
   <Import Project="packaging.targets" />
-  <!-- For regenerating templates on build -->
-  <Import Project="..\common\t4.targets" />
-  <Import Project="versioning.targets" />
   <!--
     This is a workaround for allowing neutral CTO resource produced from *.vsct to go in the main assembly.
     We move the neutral *.cto file to be categorized as WithCulture=true,Culture=en to prevent the tools from falsely reporting: