[BRLTTY] Honor distribution LDFLAGS when building drivers

[Jaroslav Skarvada]

----- Original Message -----
> [quoted lines by Jaroslav Skarvada on 2018/05/22 at 11:42 -0400]
> 
> >> Are you the person who maintains brltty for Fedora?
> >> 
> >I am co-maintainer in Fedora, maintainer in RHEL
> 
> Looking at Fedora 28, the systemd service unit for brltty specifies:
> 
>    WantedBy=multi-user.target
> 
> I wonder if you guys might consider changing this as braille isn't only
> desirable when the system is running normally. A blind user would really like
> his/her braille device to be operational as soon as possible, e.g. so that
> he/she can perform maintenance or when there's a system boot problem. It'd
> actually be useful as a dracut module for when the boot goes into the
> initramfs
> emergency shell (as has recently happened to me).
> 

This is good point, I will take a look and I will try to improve it,

thanks & regards

Jaroslav