update

Author: Shane32

Directory.Build.targets

@@ -1,11 +1,5 @@
 <Project>
 
-  <!-- Define SYSTEM_DRAWING and HAS_SPAN -->
-  <PropertyGroup>
-    <DefineConstants Condition="'$(TargetFramework)' != 'netstandard1.3'">$(DefineConstants);SYSTEM_DRAWING</DefineConstants>
-    <DefineConstants Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'netcoreapp2.1')) OR '$(TargetFramework)' == 'netstandard2.1'">$(DefineConstants);HAS_SPAN</DefineConstants>
-  </PropertyGroup>
-
   <!-- Strong name signing for Release builds of packable projects -->
   <PropertyGroup Condition="'$(Configuration)' == 'Release'">
     <SignAssembly>true</SignAssembly>