cc/gcc: backport upstream fix for GCC 4.7.0 bug 54494

See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54494, also has a serious
impact on the Linux/MIPS kernel build.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

 reporter_name="Remy Bohmer"

 reporter_url="linux@bohmer.net"

 reporter_comment="Example for building a toolchain for m68000 bare metal targets"