buildroot

Bump TCL version and switch to the autotools infrastructure

The version of TCL is bumped from 8.4.9 to 8.4.19, which fixes the
build breakage reported by Maxime Ripard <maxime.ripard@anandra.org>
on January, 6th, 2010.

The tcl-strtod patch is kept since it is still needed, the two other
patches are no longer useful.

At the same time, the package is converted to the autotools
infrastructure.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>