[PATCH] Also install data-directory into the build directory as computed by relocate_gdb_directory

[Joel Brobecker]

> I'm not entirely comfortable with having normal makes (as in "make
> all") create files outside of its build directory (and by this I mean
> $obj/gdb/../anything).

Neither am I, actually.

All in all, although I was one of the first few ones to ask for
being able to run GDB from the build directory, I just feel like
we aren't able to implement in a form that would be convenient
(Eg: command-line option), or else it'd open a can of worms (installing
stuff outside of the build directory), or come with ample caveats.
Best to recognize when the cure is worse than the disease and live
with it instead...

-- 
Joel