libstdc++ configure fail due to -EL option

[Zhenqiang Chen]

>
> -EL is only valid for mips gcc as far as ct-ng is concerned. It should
> not be used for arm configurations since arm is little endian by
> default pluis this is an invalid option you need
> -mlittle-endian for arm if you really want to specify it explicitly.

-EL/-EB is added in crosstool-ng automatically. Here is the code
segment in scripts/functions

CT_DoBuildTargetTuple() {
    # Set the endianness suffix, and the default endianness gcc option
    case "${CT_ARCH_ENDIAN}" in
        big)
            target_endian_eb=eb
            target_endian_el=
            CT_ARCH_ENDIAN_CFLAG="-mbig-endian"
            CT_ARCH_ENDIAN_LDFLAG="-EB"
            ;;
        little)
            target_endian_eb=
            target_endian_el=el
            CT_ARCH_ENDIAN_CFLAG="-mlittle-endian"
            CT_ARCH_ENDIAN_LDFLAG="-EL"
            ;;
    esac

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