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>

# This file declares functions to install the kernel headers for mingw

# Copyright 2009 Bart vdr. Meulen

# Licensed under the GPL v2. See COPYING in the root of this package

CT_DoKernelTupleValues() {

    CT_TARGET_KERNEL="mingw32"

    CT_TARGET_SYS=

}

do_kernel_get() {

    CT_GetFile "w32api-${CT_W32API_VERSION}-mingw32-src" \

        http://downloads.sourceforge.net/sourceforge/mingw

}

do_kernel_extract() {

    CT_Extract "w32api-${CT_W32API_VERSION}-mingw32-src"

}

do_kernel_headers() {

    CT_DoStep INFO "Installing kernel headers"

    mkdir -p "${CT_SYSROOT_DIR}/include"

    cp -r ${CT_SRC_DIR}/w32api-${CT_W32API_VERSION}-mingw32/include \

          ${CT_SYSROOT_DIR}

    CT_EndStep

}