cc/gcc: remove svn source

Since we now have the opportunity to use a custom local directory/tarball
as the source for gcc, it no longer makes sense to retrieve gcc ourselves
from its subversion repository.

Cc: Bryan Hundven <bryanhundven@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

reporter_name="Martin Lund"

reporter_url="http://www.doredevelopment.dk"

reporter_comment=""