Log message:
bdf2sfd: update to 1.1.1.

pkgsrc changes:

- Added GITHUB_RELEASE directives to fetch release file
- Enable test suite

ChangeLog:

bdf2sfd 1.1.1 (2020-03-30)

- Free a bunch of allocations on exit, to appease LSan
- Add links to NetBSD and Void Linux packages
- Drop the stride array, and calculate stride directly
- Add an error() function to wrap errx() calls
- Add tests for different BDF sizes, using stripped down versions of Spleen

Log message:
converters/bdf2sfd: import bdf2sfd-1.1.0.

bdf2sfd is a BDF to SFD converter, allowing to vectorize bitmap fonts.

It works by converting each pixel of a glyph to a polygon, which produces
large and unoptimized SFD files that should be post-processed using FontForge.