[treelang] removes the distdir target

[Rafael Ávila de Espíndola]

Some time ago I submitted a patch to remove the distdir target from treelang 
and fortran. Only the treelang part was approved. Because of this, I have 
split the patch in two. This half is treelang specific.

Rafael

gcc/treelang/ChangeLog:
            * Make-lang.in (treelang.distdir) Remove.
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