The ext-toolchain.sh utility script implements various external toolchain tasks:
* Testing of available features, like c++, soft-float or ipv6 support
* Finding the libc implementation (uclibc or eglibc/glibc)
* Inferring the GNU target name
* Finding shared objects for packaging (libc, libpthread, ...)
* Finding executables for packaging (ldd, gdbserver, ...)
* Generating wrapper scripts for toolchain commands
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29765 3c298f89-4303-0410-b956-a3cf2f4a3e73
