Remove netstandard2.0 and add net472

LibGit2Sharp/Core/NativeMethods.cs

@@ -66,7 +66,7 @@ private static string GetGlobalSettingsNativeLibraryPath()
             return Path.Combine(nativeLibraryDir, libgit2 + Platform.GetNativeLibraryExtension());
         }
 
-#if NETSTANDARD
+#if NETFRAMEWORK
         private static bool TryUseNativeLibrary() => false;
 #else
         private static bool TryUseNativeLibrary()

LibGit2Sharp/LibGit2Sharp.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>
+    <TargetFrameworks>net472;net6.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Description>LibGit2Sharp brings all the might and speed of libgit2, a native Git implementation, to the managed world of .NET</Description>
     <Company>LibGit2Sharp contributors</Company>