cc/gcc: add patch for 4.7.2

This patch fixes compilation of gcc when C++ is enabled and MMX is
available, but not SSE/SSE2/AVX.

Signed-off-by: Richard Braun <rbraun@sceen.net>
Message-Id: <20121126105642.GA12098@mail.sceen.net>
Patchwork-Id: 201648

 # Compute sparc-specific values

 CT_DoArchTupleValues() {

     # That's the only thing to override

     if [ "${CT_ARCH_64}" = "y" ]; then

         CT_TARGET_ARCH="${CT_ARCH}64"

     fi

 }