4.22 UnrealHeaderTool getting called every build, even if there are no changes

You deserve the title: LEGEND.
This issue has held me back from investing time to learn UE4 for over 2 years now.
But I eventually decided to go through pain of waiting at least 20s for every build.
This fix makes my build times only 2s max. Ground breaking
With this discovery I’ve just falling more in love with UE4.
Thanks, Thanks, Thanks Big time.