dev branch: fasteners/threads triggers CGAL error

[rpavlik]

Specifically, if you just load and run fasteners/threads in the 2017/11/12 snapshot (7cb1e93), you'll get these among your errors:

ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: ss_plane.has_on(sv_prev->point()) File: /opt/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/polygon_mesh_to_nef_3.h Line: 294 
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: ss_plane.has_on(sv_prev->point()) File: /opt/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/polygon_mesh_to_nef_3.h Line: 294 
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: ss_plane.has_on(sv_prev->point()) File: /opt/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/polygon_mesh_to_nef_3.h Line: 294 
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: ss_plane.has_on(sv_prev->point()) File: /opt/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/polygon_mesh_to_nef_3.h Line: 294 
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: ss_plane.has_on(sv_prev->point()) File: /opt/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/polygon_mesh_to_nef_3.h Line: 294 

OpenSCAD issue associated: openscad/openscad#1081

Interestingly it works in 2015.03-2. (Testing on Windows using the official x64 builds)

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[kintel]

I think this is a duplicate of openscad/openscad#2139