Log Message:
bdf2sfd: update to 1.1.6.

bdf2sfd 1.1.6 (2021-02-12)

- Stop forcing FORTIFY_SOURCE=2, it should be package builders decision
- Get rid of global variables, move all declarations to main()
- Remove dead increments for argc and argv
- Rename a few variables to get rid of all camelCase occurences
- Reorder and reformat variables declaration
- Try to harmonize usage information everywhere
- Rename the displayUsage() function to usage()