cad/ghdl: Update 5.0.1 => 5.1.1

Changelogs:

• https://github.com/ghdl/ghdl/releases/tag/v5.1.1
• https://github.com/ghdl/ghdl/compare/v5.0.1...v5.1.1

• Mark as PIE_UNSAFE
• Pet portclippy(1) and portfmt(1)

Approved by: yuri@ (maintainer, Mentor)

Differential Revision: https://reviews.freebsd.org/D52859