scripts/addToolsVersion: handle elf2flt

The one was missing from the list.

It is very improbable that we ever need it, as elf2flt does no release,
and we always get it from CVS head. But for the sake of consistency, we
just add it.

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

 # Default test suite configuration

 # Default DejaGnu configuration

 DG_TOOLNAME = gcc

 DG_TARGET_HOSTNAME = 127.0.0.1

 DG_TARGET_USERNAME = root

 # Default tests

 DG_C_TESTS = 

 DG_CPP_TESTS =