Disable warning CS2008 (No source files specified) in VSIX project

Author: sharwell

AsyncUsageAnalyzers/AsyncUsageAnalyzers.Vsix/AsyncUsageAnalyzers.Vsix.csproj

@@ -36,6 +36,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <NoWarn>2008</NoWarn>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -44,6 +45,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <NoWarn>2008</NoWarn>
   </PropertyGroup>
   <PropertyGroup>
     <StartAction>Program</StartAction>