cc/gcc: add gcc-4.7.0

Add the new release gcc-4.7.0.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
[yann.morin.1998@free.fr: add 4.7.0 patch]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

reporter_name="Ioannis E. Venetis"

reporter_url="http://sourceware.org/ml/crossgcc/2011-05/msg00005.html"

reporter_comment=""