cad/netgen-lvs: Update 1.5.300 => 1.5.305

[alven]

Summary

Changelogs:

• http://opencircuitdesign.com/netgen/history.html
• https://github.com/RTimothyEdwards/netgen/compare/1.5.300...1.5.305

• Use standard SHEBANG_FILES instead of custom post-patch

Test Plan

For every {amd64, i386} × {14.3, 13.5}:

• Successful poudriere testport
• Successful run-testing

[yuri]

Approved.

Thanks,
Yuri