Fix use of include guard in <sys/procfs.h>

[Roland McGrath]

> With the unified powerpc kernel headers the include guard for <asm/elf.h>
> has changed.
> 
> Andreas.
> 
> 2006-04-03  Andreas Schwab  <schwab@suse.de>
> 
> 	* sysdeps/unix/sysv/linux/powerpc/sys/procfs.h: Adjust test for
> 	<asm/elf.h>.

I put this in.


Thanks,
Roland