* tc-hppa.c: General cleanups of ELF support. No more spaces

    * tc-hppa.c: General cleanups of ELF support.  No more spaces
        and subspaces for ELF.
        (GDB_DEBUG_SPACE_NAME): Delete definition for ELF.
        (GDB_STRINGS_SUBSPACE_NAME): Likewise.
        (GDB_SYMBOLS_SUBSPACE_NAME): Likewise
        (UNWIND_SECTION_NAME): Likewise.
        (space/subspace related structures): Conditionalize definitions
        on OBJ_SOM.
        (space/subspace directives and support routines): Conditionalize
        definitions and references/uses on OBJ_SOM.
        (label_symbol_struct): For ELF, track the symbol's segment.  For
        SOM track its space.
        (pa_define_label, pa_undefine_label, pa_get_label): Corresponding
        changes.
        (USE_ALIASES): Kill for both SOM & ELF.
        (pa_def_subspaces, pa_def_spaces): Corresponding changes.
        (pa_space, pa_subspace): Corresponding changes.
        (pa_spaces_begin): Corresponding chagnes.
        (md_begin): Do not muck around with space/subspace stuff for
        OBJ_ELF.
        (md_apply_fix): Temporarily disable argument relocation stuff
        for OBJ_ELF.
        (tc_gen_reloc): Temporarily disable relocation generation for
        OBJ_ELF
        (pa_build_unwind_subspace): Similarly.