BUG: missing netstandard2.0 target for plugins (all *.dll files)

[ArnCarveris]

Building SampleGame client standalone windows build with IL2CPP causes exception:

NotSupportedException: System.Configuration.ConfigurationManager::get_AppSettings
  at System.Configuration.ConfigurationManager.get_AppSettings () [0x00000] in <00000000000000000000000000000000>:0 
  at Amazon.AWSConfigs..cctor () [0x00000] in <00000000000000000000000000000000>:0 
  at Amazon.Runtime.ClientConfig..ctor (Amazon.Runtime.Internal.IDefaultConfigurationProvider defaultConfigurationProvider) [0x00000] in <00000000000000000000000000000000>:0 
  at Amazon.GameLift.AmazonGameLiftConfig..ctor () [0x00000] in <00000000000000000000000000000000>:0 
  at Amazon.GameLift.AmazonGameLiftClient..ctor (System.String awsAccessKeyId, System.String awsSecretAccessKey, Amazon.RegionEndpoint region) [0x00000] in <00000000000000000000000000000000>:0 
  at GameLiftClient..ctor (GameLiftApiCredentials apiCredentials, Delay delay, Logger logger) [0x00000] in <00000000000000000000000000000000>:0 
  at GameLift.Awake () [0x00000] in <00000000000000000000000000000000>:0 
Rethrow as TypeInitializationException: The type initializer for 'Amazon.AWSConfigs' threw an exception.
  at Amazon.Runtime.ClientConfig..ctor (Amazon.Runtime.Internal.IDefaultConfigurationProvider defaultConfigurationProvider) [0x00000] in <00000000000000000000000000000000>:0 
  at Amazon.GameLift.AmazonGameLiftConfig..ctor () [0x00000] in <00000000000000000000000000000000>:0 
  at Amazon.GameLift.AmazonGameLiftClient..ctor (System.String awsAccessKeyId, System.String awsSecretAccessKey, Amazon.RegionEndpoint region) [0x00000] in <00000000000000000000000000000000>:0 
  at GameLiftClient..ctor (GameLiftApiCredentials apiCredentials, Delay delay, Logger logger) [0x00000] in <00000000000000000000000000000000>:0 
  at GameLift.Awake () [0x00000] in <00000000000000000000000000000000>:0