cc/gcc: backport upstream patches for GCC bug 54369

See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369 for more information
This bug has a serious effect on Linux/MIPS and SPARC kernel builds.

Add the fix for these versions of gcc: 4.6.0, 4.6.2, 4.6.3, and 4.7.0.

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

# Compute Blackfin-specific values

CT_DoArchTupleValues() {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="bfin"

    # gcc ./configure flags

    CT_ARCH_WITH_ARCH=

    CT_ARCH_WITH_ABI=

    CT_ARCH_WITH_CPU=

    CT_ARCH_WITH_TUNE=

    CT_ARCH_WITH_FPU=

    CT_ARCH_WITH_FLOAT=

}