Fix build and use specific version of dotnet-format.

ICSharpCode.Decompiler/IL/Transforms/DelegateConstruction.cs

@@ -162,7 +162,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 		}
 
 		ILFunction TransformDelegateConstruction(
-			ILInstruction value, IMethod targetMethod, 
+			ILInstruction value, IMethod targetMethod,
 			ILInstruction target, IType delegateType)
 		{
 			if (!IsAnonymousMethod(decompilationContext.CurrentTypeDefinition, targetMethod))

appveyor.yml

@@ -13,7 +13,7 @@ init:
 install:
 - git submodule update --init --recursive
 - pwsh .\BuildTools\appveyor-install.ps1
-- dotnet tool install dotnet-format --tool-path BuildTools
+- dotnet tool install dotnet-format --tool-path BuildTools --version 4.1.131201
 
 nuget:
   account_feed: false

azure-pipelines.yml

@@ -52,7 +52,7 @@ jobs:
     inputs:
       command: 'custom'
       custom: 'tool'
-      arguments: 'install dotnet-format --tool-path $(Agent.ToolsDirectory)/dotnet-format'
+      arguments: 'install dotnet-format --tool-path $(Agent.ToolsDirectory)/dotnet-format --version 4.1.131201'
 
   - script: pwsh .\BuildTools\pipelines-install.ps1
     displayName: Install