[gtkada] fixes for gate.sh

[Brian.Hanson at lawson.com]

I found that on my NT system the "dirname" and "mkdir" provided with
gtkada-1.3.8 did not work correctly.  "mkdir -p"
just did not work.  In addition the script uses /dev/null which does not exist
on my system.
I changed the script to use shell syntax to get the dirname.  I also changed it
to use mkdir from the mks toolkit
I have installed.  An alternate fix would be to create each of the parent
directories prior to the child.  I changed
/dev/null to "dev_null" which I then removed.  Finally I made sure that
".gate/gate.difs" was removed prior to
appending the new changes.

With these fixes glade worked well for me.


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