build-aux: autoconf 2.64.
build-aux: autoconf 2.64.

It seems that M4sh no longer defines as_me.

	* build-aux/base.m4sh (_URBI_ABSOLUTE_PREPARE): Define as_me and
	as_echo.
	Use the latter.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport