Description

Minor follow-up of #4951

Putting the PCH's in separate headers with a pragma block seemed to help build speeds somehow by about 10s or so.

This unifies and simplifies the PCH config across platforms as well

Type of change

• Build optimization

Testing

CI

Checklist

• I have tested my changes
• I have performed a self-review of my code. Ensuring variables, functions and methods are named in a human-readable way, comments are added only where naming of variables, functions and methods can't give enough context.
• I own the changes of my code and take responsibility for the potential issues that occur