samples: update i686-nptl-linux-gnu

Notable changes:
- uses binutils 2.21, builds gold, but defaults to ld
- uses gcc 4.5.2, with GRAPHITE and LTO, builds lto-plugin

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 #!/bin/sh

 call_to=@@DEFAULT_LD@@

 case "${CTNG_LD_IS}" in

     bfd)    call_to=bfd;;

     gold)   call_to=gold;;

 esac

 exec "${0}.${call_to}" "$@"

 exit $?