cc/gcc: add option to compile against static libstdc++, for gcc-4.4 and newer

Idea and know-how taken from CodeSourcery build script.

Normal build:
$ ldd arm-unknown-linux-uclibcgnueabi-gcc
linux-gate.so.1 => (0xb77f3000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb76e8000)
libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb75a1000)
libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb757a000)
/lib/ld-linux.so.2 (0xb77f4000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb755c000)

CC_STATIC_LIBSTDCXX=y:
$ ldd arm-unknown-linux-uclibcgnueabi-gcc
linux-gate.so.1 => (0xb7843000)
libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb76e6000)
/lib/ld-linux.so.2 (0xb7844000)

I made CC_STATIC_LIBSTDCXX default=y since I think
it is always desirable.

Signed-off-by: Johannes Stezenbach <js@sig21.net>

reporter_name="Nate CASE"

reporter_url="http://sourceware.org/ml/crossgcc/2008-10/msg00016.html"

reporter_comment="This is a sample config file for Freescale e500v2 processors (e.g.,

MPC8548, MPC8572).  It uses eglibc (for e500/SPE patches) and a recent

gcc (4.3.1, for e500v2 DPFP support) and will generate appropriate

dual-precision floating point instructions by default.

Note: If building a Linux kernel with this toolchain, you will want to

make sure -mno-spe AND -mspe=no are passed to gcc to prevent SPE

ABI/instructions from getting into the kernel (which is currently

unsupported).  At this time, the kernel build system only passes

-mno-spe by default (this should be fixed soon hopefully)."