binutils/elf2flt: use alternate mirror

The official elf2flt upstream has disapeared.

Switch to a mirror.

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

reporter_name="Julien DUSSER"

reporter_url="http://sourceware.org/ml/crossgcc/2008-10/msg00054.html"

reporter_comment="Soft-float for the 405 PowerPC"