Log Message:
spleen: update to 1.7.0.

Spleen 1.7.0 (2020-02-13)

- Improve generated PSF files so that box-drawing characters are correctly
  displayed
- Add the FONT_VERSION XFLD property for all BDF sizes
- Generate OpenType (OTF) versions for the 8x16, 12x24, 16x32 and 32x64 sizes
- Stop generating .dfont files, OTF versions should be used instead
- Add links to Debian and Ubuntu packages