feat(vendor/msgpack-cs): remove symbols from unit test project

Author: manups4e

MsgPack.Tests/MsgPack.Tests.csproj

@@ -4,7 +4,6 @@
     <TargetFramework>net48</TargetFramework>
     <IsPackable>false</IsPackable>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
-	<DefineConstants>DEBUG;TRACE;UNIT_TEST</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>