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 ltrace-0.4.orig/configure ltrace-0.4/configure

--- ltrace-0.4.orig/configure	2008-10-23 23:19:38.000000000 +0200

+++ ltrace-0.4/configure	2008-10-23 23:19:06.000000000 +0200

@@ -1392,6 +1392,9 @@

 HOST_OS="$host_os"

+case "${HOST_OS}" in

+  linux-*) HOST_OS=linux-gnu;;

+esac

 ac_ext=c

diff -durN ltrace-0.4.orig/configure.ac ltrace-0.4/configure.ac

--- ltrace-0.4.orig/configure.ac	2008-10-23 23:19:43.000000000 +0200

+++ ltrace-0.4/configure.ac	2008-10-23 23:18:44.000000000 +0200

@@ -7,6 +7,9 @@

 dnl Check host system type

 AC_CANONICAL_HOST

 HOST_OS="$host_os"

+case "${HOST_OS}" in

+  linux-*) HOST_OS=linux-gnu;;

+esac

 AC_SUBST(HOST_OS)

 dnl Checks for programs.