[UE]Change build environment and add custom compiler arguments

[yangruihan]

Change xxx.Target.cs in your project

bOverrideBuildEnvironment = true;
AdditionalCompilerArguments = "-Wno-ignored-attributes";

reference:

• https://docs.unrealengine.com/4.27/en-US/ProductionPipelines/BuildTools/UnrealBuildTool/TargetFiles/