script: allow to pass any float value for CT_LOAD

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Message-Id: <b51acf21c72b4a8e882e.1359320015@laptop>
Patchwork-Id: 216062

reporter_name="Gustavo Zacarias <gustavo@zacarias.com.ar>"

reporter_url="http://sourceware.org/ml/crossgcc/2011-03/msg00028.html"

reporter_comment=""