Update soruces to make alpha, arc and arm targets compile cleanly

    Update soruces to make alpha, arc and arm targets compile cleanly
        with -Wc++-compat:
        * config/tc-alpha.c: Add casts.
        (extended_bfd_reloc_code_real_type): New type. Used to avoid
        enumeration conversion warnings.
        (struct alpha_fixup, void assemble_insn, assemble_insn)
        (assemble_tokens): Use new type.
        * ecoff.c: Add casts. (mark_stabs): Use enumeration names.
        * config/obj-elf.c: Add cast
        * config/tc-arc.c: Add casts.
        * config/obj-aout.h (text_section,data_section,bss_section):
        Make extern.
        * config/obj-elf.c: Add cast.
        * config/tc-arm.c: Add casts.
        (X, TxCE, TxCE, TxC3, TxC3w, TxCM_, TxCM, TUE, TUF, CE, CL, cCE)
        (cCL, C3E, xCM_, nUF, nCE_tag): Change input format to avoid the
        need for keywords as arguments.
        * ecoff.c: Add casts.
        * ecofflink.c: Add casts.
        * elf64-alpha.c: Add casts.
        (struct alpha_elf_got_entry, struct alpha_elf_reloc_entry): Move
        to top level.
        (SKIP_HOWTO): Use enum name.
        * elf32-arm.c: Add casts.
        (elf32_arm_vxworks_bed): Update code to avoid multiple
        declarations.
        (struct map_stub): Move to top level.
        * arc-dis.c Fix casts.
        * arc-ext.c: Add casts.
        * arm-dis.c (enum opcode_sentinel_enum): Gave name to anonymous
        enum.
        * emultempl/armelf.em: Add casts.