Remove NativeBinaries dependency when building for MonoDevelop

Fixes VSTS #937854

Author: sevoku

LibGit2Sharp/LibGit2Sharp.csproj

@@ -31,12 +31,12 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="LibGit2Sharp.NativeBinaries" Version="[2.0.267]" PrivateAssets="none" />
     <PackageReference Include="Nerdbank.GitVersioning" Version="2.1.23" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup Condition="!Exists('..\..\..\MonoDevelop.props')">
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="all" />
+    <PackageReference Include="LibGit2Sharp.NativeBinaries" Version="[2.0.267]" PrivateAssets="none" />
   </ItemGroup>
 
   <Import Project="..\Targets\CodeGenerator.targets" />