liburbi-check: no Valgrind on Etch.
liburbi-check: no Valgrind on Etch.

	* src/tests/bin/liburbi-check.m4sh: here.
	Also, fix the ping special case.

urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi