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>

diff -durN gcc-4.2.1.orig/gcc/config.gcc gcc-4.2.1/gcc/config.gcc

--- gcc-4.2.1.orig/gcc/config.gcc	2007-02-03 06:25:20.000000000 +0100

+++ gcc-4.2.1/gcc/config.gcc	2007-08-03 20:29:52.000000000 +0200

@@ -1964,7 +1964,7 @@

         ;;

 sh-*-elf* | sh[12346l]*-*-elf* | sh*-*-kaos* | \

 sh-*-symbianelf* | sh[12346l]*-*-symbianelf* | \

-  sh-*-linux* | sh[346lbe]*-*-linux* | \

+  sh*-*-linux* | sh[346lbe]*-*-linux* | \

   sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \

    sh64-*-netbsd* | sh64l*-*-netbsd*)

 	tmake_file="${tmake_file} sh/t-sh sh/t-elf"