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 is the README for crosstool-NG

TABLE OF CONTENT /

________________/

  - GETTING STARTED

  - CREDITS

  - KNOWN ISSUES

GETTING STARTED /

_______________/

To get you started, just enter:

  ./configure --help

You can find a (terse and WIP) documentation in docs/overview.txt.

Here's a summary of what you'll find in there:

  Introduction

  History

  Installing crosstool-NG

  Configuring crosstool-NG

  Running crosstool-NG

  Using the toolchain

  Toolchain types

  Contributing

  Internals

You can also point your browser at:

  http://ymorin.is-a-geek.org/projects/crosstool

CREDITS /

_______/

The people that helped are listed in docs/CREDITS. Many thanks to them! :-)

KNOWN ISSUES /

____________/

The list of known issues is listed in docs/known-issues.txt.

Aloha!