Changed capitalization of key file. Tried to fix CI error.

Author: NogginBops

openTK.snk renamed to OpenTK.snk

@@ -7,10 +7,6 @@
         <AssemblyOriginatorKeyFile>../../OpenTK.snk</AssemblyOriginatorKeyFile>
     </PropertyGroup>
 
-    <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
-      <DocumentationFile>bin\Release\OpenTK.Compute.xml</DocumentationFile>
-    </PropertyGroup>
-
     <Import Project="..\..\props\common.props" />
     <Import Project="..\..\props\nuget-common.props" />
     <Import Project="..\..\props\stylecop.props" />

src/OpenTK.Compute/OpenTK.Compute.csproj

@@ -25,6 +25,10 @@
     <ProjectReference Include="..\Generator.Rewrite\Generator.Rewrite.csproj" SkipGetTargetFrameworkProperties="true" UndefineProperties="TargetFramework" ReferenceOutputAssembly="false" ExcludeAssets="all" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Build.Tasks.Core" Version="17.1.0" ExcludeAssets="runtime" />
+  </ItemGroup>
+
   <!-- Define what files we depend on and which files are generated -->
   <ItemGroup>
     <GLSpec Include="..\gl.xml" />