* Makefile.am (elf32-arm-oldabi.lo): New.

        (elf32-arm-newabi.lo):  New.
        * Makefile.in:  Regenerate.
        * config.bfd (thumb-*-elf):  Remove definition of targ_underscore.
        (arm-*-elf):  Likewise.
        (arm-*-oabi):  New.
        (thumb-*-oabi):  New.
        * configure:  Regenerate.
        * configure.in (bfd_elf32_littlearm_oabi_vec):  New.
        (bfd_elf32_bigarm_oabi_vec):  New.
        * elf32-arm-newabi.c:  New.
        * elf32-arm-oldabi.c:  New.
        * elf32-arm.c:  Removed.
        * elf32-arm.h:  New.