[BRLTTY] Honor distribution LDFLAGS when building drivers

[Jaroslav Skarvada]

Hi,

there is the following downstream Fedora bugzilla [1] requesting
the drivers to be build with the distribution LDFLAGS.

I used the attached hack to fix the problem, but I think it
should be also addressed upstream (probably more clean way)

thanks & regards

Jaroslav

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1543490
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