ENTRY for elf64alpha.sh

[Jason R Thorpe]

I know this change was made quite a while ago, but rev 1.5 of elf64alpha.sh:

2000-11-28  David O'Brien  <obrien@dragon.nuxi.com>
	* emulparams/elf64alpha.sh (ENTRY): Remove leading underscore as ELF
	  does not use them.

...broke NetBSD/alpha, which has a standard entry point of __start().

I suppose David made this change for FreeBSD/alpha; should he have created
an elf64alpha_fbsd.sh, or should I now create an elf64alpha_nbsd.sh?

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>