cad/openvsp: update to 3.40.1

ChangeLog: https://github.com/OpenVSP/OpenVSP/releases/tag/OpenVSP_3.40.0

Features:

• Individual blade folding
• Non-uniform blade spacing
• Blade balance calculation and control
• Online help infrastructure
• Help cheat sheet for advanced linking
• Improved 4-view view selection
• Multi view control hot keys
• FEA Mesh API additions
• View and material setting API additions
• 3D background file API additions

Build system:

• Update FLTK to latest 1.4.pre version

Bug fixes:

• Fix grid lines not drawing on Windows
• Adjust tolerance in MergeBorderEndPoints
• Fix build system for facade generation
• Use ParmContainer::EncodeXml/DecodeXml when writing simple links
• Fix missing inputs for parasite drag analysis
  
  3.40.1 contains a fix that made 3.40.0 crash in some situations.
• Add pandoc dependency
• Use MAKE_JOBS_UNSAFE to workaround a race condition when copying a file