cc/gcc: pass the language list to the core backend

As the core backend can be used to also build the bare-metal compiler,
we have to tel it what languages to build.

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

 reporter_name="Ioannis E. VENETIS"

 reporter_url="http://sourceware.org/ml/crossgcc/2009-11/msg00109.html"

 reporter_comment=""