[commit/Ada] Fix unconstrained packed array size

[Joel Brobecker]

> >     gdb/testsuite/ChangeLog:
> >     
> >             * gdb.ada/packed_array.exp: Add xfail for "print u_var" if
> >             the debugger is unable to find the array bounds.
> 
> OK, I find it better this way.

Thanks (and thanks for sending the binaries, allowing me to reproduce
the problem). The patch is now in.

-- 
Joel