* elf32-m68k.c: Rewrite initialization of GOT entries for TLS

    * elf32-m68k.c: Rewrite initialization of GOT entries for TLS
        relocations.  Rewrite output of dynamic TLS relocations.
        (DTP_OFFSET, TP_OFFSET): New constants.
        (dtpoff_base): Update.
        (tpoff): Rename to tpoff_base, update.
        (elf_m68k_init_got_entry_static, elf_m68k_init_got_entry_local_shared):
        New functions.  Move code from elf_m68k_relocate_section here.
        (elf_m68k_relocate_section): Update.
        (elf_m68k_finish_dynamic_symbol): Fix handling of local TLS symbols.