Your change
* rules2, rules.defs, rules.conf: $(with_libssp): remove, use only
$(with_ssp). Fixes a bug whereby libssp was always built as part
of gnat-4.2.
is wrong; it doesn't work on platforms where ssp is enabled, but the
target libc doesn't support ssp (and therefore the libssp package
needs to be built). Please revert.
Matthias