* configure.in (i386-*-sco*elf*): Use fmt elf, targ sco5.
* configure: Rebuild.
* config/sco5.mt: New file; set TDEFINES to -DSCO_ELF.
* config/tc-i386.c (sco_id): New function, if SCO_ELF.
* config/tc-i386.h (tc_init_after_args): Define if SCO_ELF.
(sco_id): Declare if SCO_ELF.