* elf32-s390.c (s390_elf_ldisp_reloc): New prototype.

    * elf32-s390.c (s390_elf_ldisp_reloc): New prototype.
        (s390_tls_reloc): New function.
        (elf_howto_table): Add long displacement relocations R_390_20,
        R_390_GOT20, R_390_GOTPLT20 and R_390_TLS_GOTIE20.
        (elf_s390_reloc_type_lookup): Likewise.
        (elf_s390_check_relocs): Likewise.
        (elf_s390_gc_sweep_hook): Likewise.
        (elf_s390_relocate_section): Likewise.
        * elf64-s390.c: Same changes as for elf32-s390.c.
        * reloc.c: Add long displacement relocations BFD_RELOC_390_20,
        BFD_RELOC_390_GOT20, BFD_RELOC_390_GOTPLT20 and
        BFD_RELOC_390_TLS_GOTIE20.
        * bfd-in2.h: Regenerate.
        * libbfd.h: Likewise.