[klibc] Shell scripts broken in klibc-0.114

[H. Peter Anvin]

Patrick J. LoPresti wrote:
> In klibc-0.114, any shell script like this:
> 
> ======================================================================
> #!/path/to/klibc-0.114/ash/sh
> 
> echo hi
> ======================================================================
> 
> ...elicits the following error when executed:
> 
>   /var/tmp/hack.sh: Can't open /var/tmp/hack.sh
> 

Problem identified and fixed; the problem is that open() can take either
2 or 3 arguments, which means that it needs to be a varadic function.
Unfortunately varadic functions are always called without regparm.

Workaround checked in as klibc-0.115.

	-hpa