cad/horizon-eda: Update 2.7.0 => 2.7.1

[alven]

Summary

Changelogs:

• https://github.com/horizon-eda/horizon/releases/tag/v2.7.1
• https://github.com/horizon-eda/horizon/compare/v2.7.0...v2.7.1

• Clarify LICENSE
• Pet portclippy(1) and portfmt(1)

MFH: 2025Q4

Test Plan

For every {amd64} × {14.3, 13.5}:

• Successful poudriere testport
• Successful run-testing

[yuri]

Approved once the note in the comment is implemented.

Thanks,
Yuri

cad/horizon-eda/Makefile

33

Please don't move the USE_GNOME line here.

This is a GitHub related section, USE_GNOME should remain where it was.