cc/gcc: add linaro 4.6 pre-release

Before gcc 4.6 was released, Linaro has a pre-release available.
Include that version in the config list.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 reporter_name="Harold Grovesteen"

 reporter_url="http://sourceware.org/ml/crossgcc/2009-11/msg00052.html"

 reporter_comment=""