Bug 1730: Assembly is not signed

https://winscp.net/tracker/1730

Re-enabling code signing that was lost by d49ae8072b0.

(cherry picked from commit 9b9dfa4305ef3daaac55fc971a8761510ce08507)

Source commit: 46933f8ff35c8b9b1a25747d62fabbca640335e5

dotnet/WinSCPnet.csproj

@@ -5,6 +5,8 @@
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <OutputPath>bin\$(Configuration)</OutputPath>
+    <SignAssembly>false</SignAssembly>
+    <AssemblyOriginatorKeyFile></AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(TargetFramework)' == 'netstandard2.0'">
     <DefineConstants>NETSTANDARD</DefineConstants>