Update to 3.12.1

Update cad/openvsp to 3.12.1 _and_ unbreak cad/openvsp. The recent
update to eigen3 broke cad/openvsp (since it is used directly) and
graphics/code-eli that is a dependency of cad/openvsp.

Until there is a fix for code-eli change the port to use the internal
eigen3 and code-eli packages bundled in the distribution.

In addition, one of the local patches was accepted upstream and is no
longer necessary.

From the announcement:

Features:

• Parasite drag buildup tool
• Full control of VSPAERO from OpenVSP GUI
• DegenGeom preview visualization
• Advanced control surface modeling

Bug Fixes:

• Advanced links not loading from file with 'Loop' policy geoms
• Crash conformal components with some file airfoils
• CompGeom when subsurfaces fall on tessellation line
• DegenGeom handling of tip caps with blended wings
• CustomGeom name matching GUI mismatch

PR: 220212
Submitted by: fernando.apesteguia@gmail.com (maintainer)