Remove unused TKINTER_PROTECT_LOADTK code

[chrstphrchvz]

The TKINTER_PROTECT_LOADTK macro and relevant code (originally for #49372) are only defined for Tk 8.4.13 and earlier, but Tkinter already requires at least 8.5.12. Is there a reason to keep this code around, or can it be removed?

Linked PRs

• gh-103532: Remove TKINTER_PROTECT_LOADTK code #103535
• gh-103532: Add NEWS entry #103542
• gh-103532: Fix reST syntax in NEWS entry #103544

[zware]

Thanks for the report and patch!