[PATCH - ping] tree.c, remove a reference to obstack

[Christophe Jaillet]

Hi all,

a long time ago (2.5 years ago, yes, I know...), I posted a patch about an
unused function and what looked to me as a useless #include :
   http://gcc.gnu.org/ml/gcc-patches/2006-01/msg01483.html

The explaination is still up to date, here is just an updated patch, just in
case of interest.

Best regards
Christophe Jaillet


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