binutils/elf2flt: restore the custom location functionality

Somehow, it got lost when incorporating elf2flt in the binutils farmework.

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

 reporter_name="Alexander BIGGA"

 reporter_url="http://sourceware.org/ml/crossgcc/2008-07/msg00000.html"

 reporter_comment=""