[BRLTTY] Honor distribution LDFLAGS when building drivers

[Jaroslav Skarvada]

----- Original Message -----
> [quoted lines by Jaroslav Skarvada on 2018/04/24 at 16:49 -0400]
> 
> >It didn't work for me. There is original build log:
> >https://kojipkgs.fedoraproject.org/packages/brltty/5.6/7.fc29/data/logs/x86_64/build.log
> 
> okay, I didn't fully understand. The latest commit should fix it. Please
> retest.
> 
Thanks, it works for me. I used the patch in Fedora downstream

regards

Jaroslav