build-aux: update tools
Import from Vaucanson.
* build-aux/bin/bison++.in: No longer "cd", this produces
more accurate error message locations, which is nice when
compiling under Emacs.
* build-aux/bin/move-if-change: Beware that colordiff
might now hang on stdin.
Signed-off-by:
Roland Levillain <roland@lrde.epita.fr>
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