nanosvg-2022.12.22-bp156.1.5

- Change to version 2022.12.22
  * Specfile and service cleanup
  * Required by PrusaSlicer 2.6: requires the fltk fork from the
    tag fltk_2022-12-22 or later
  * Add soversion and adhere to shlib policy
  * nanosvg-add-soversion.patch
  * gh#memononen/nanosvg#242
  * gh#memononen/nanosvg#246

- Initial version 0.0.1~git.abcd277 copied from Mike Chikov
  at home:mrbadguy:3dPrinting/nanosvg
- Includes fix-cname-dest.patch, submitted as
  gh#memononen/nanosvg#245