gh-126107: Remove copyright block from Modules/config.c.in

[donBarbos]

Based on the last message I decided to make the this changes:

• COPYRIGHT file not found #126107 (comment)

• Issue: COPYRIGHT file not found #126107

[ghost]

All commit authors signed the Contributor License Agreement.

[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[StanFromIreland]

@gvanrossum This was originally your suggestion, what do you think? This PR which in my opinion is ready to merge as it completes the simple task has been forgotten about.

[gvanrossum]

While I think there are a lot more important things that could be done to this file (it's too slow and I suspect it tests for a lot of compiler features that are always supported by C compilers that can compile CPython), (and I suspect that you are sending this PR so can claim to have contributed to CPython on your resume :-), this is clearly the right thing to do, so I'll merge it.