* coff-i386.c (CALC_ADDEND): if reloc is PC relative, add the
vaddr of the section to the addend.
* targets.c: if MINIMIZE is 1, and SCO_CORE is defined, add
SCO_CORE to SELECT_VECS.
(target_vector): add sco_core_vec.
* sco-core.c (sco_core_vec): add leading underscore initializer.
* configure.in (i[34]86-*-sco*): use target i386-sco.
* config/i386-sco.mt: new file; define SCO_CORE.