Fix slow compile time in Unreal engine

Unreal engine version: 4.22

1. In your code editor go to the file Explorer tab and navigate to

/UE_4.22/Engine/Binaries/<depending on your system name may be different>Win64/UnrealHeaderTool.target

1. Open UnrealHeaderTool.target
2. Add a white space somewhere so you can save the file as if a change took place.
3. Compile in Unreal Engine. *The first compile after this fix may take awhile but subsequent compiles should be much shorter.