[rfa] fix alpha ld.so undef symbol

[Steven Munroe]

Roland McGrath wrote:
>> +#ifdef DL_PLATFORM_AUXV
>> +      DL_PLATFORM_AUXV
>> +#endif
>>     
>
> This looks ok to me, but make it # ifdef there inside another #ifdef.
>
> This will also affect powerpc, which AFAICT was also failing to set its
> __cache_line_size in static programs.  It looks to me like that will be fine.
>
>   
hmmm looks like powerpc needs a
sysdeps/unix/sysv/linux/powerpc/dl-support.c to define DL_PLATFORM_AUXV
and include /elf/dl-support.c ?