[DTC PATCH] Remove const from dtc_file::dir.

[Jon Loeliger]

So, like, the other day Scott Wood mumbled:
> Signed-off-by: Scott Wood <scottwood at freescale.com>
> ---
>  srcpos.c |    4 ++--
>  srcpos.h |    2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)

Oh yeah.

jdl