- Update to new upstream release 2.1.2
* wouldn't build with gcc 5.4 and 6
* mouse cursor was missing for 'Arc Tangential'
* right-click with plugins could cause a crash
* construction lines were not drawn when the line segment was out of view
* DXF files with comments were not properly loaded
* drawings were not marked as modified after an 'undo'
* the command line didn't accept numpad input
* the command widget didn't activate properly when floating
- librecad-gcc6.patch: Remove (unneeded now)