[g-a-devel] Disable the "BRLTTY's BrlAPI choice" when brltty is not available

[Samuel Thibault <samuel thibault ens-lyon org>]

Hi,

Currently, even when brltty is not installed, gnopernicus still give the
"BRLTTY's BrlAPI" choice when configuring the braille device. Of course,
if one tries to connect with it, it fails, but without any error
message, so it's difficult to find out why it fails.

Could you disable this choice when brltty is not available?

Thanks,
Samuel