RFA: fix in features/Makefile

[Tom Tromey]

>>>>> "Daniel" == Daniel Jacobowitz <drow@false.org> writes:

Daniel> stdout isn't a tty... dubious we should be doing this if it is.  I'm
Daniel> not sure why you get tui here, though, I don't think I do.  Do you
Daniel> have the gdbtui binary installed as gdb?

I passed the full path to the just-built gdb to make.

I looked at config.status and I didn't pass any argument to configure
that would affect this.  I believe my build takes the enable_tui=auto
branch and then finds all the prereqs.  So, I think this could affect
anybody, depending on what devel packages they have installed.

Tom