[Toybox] Fix, killall is not allowed to kill itself

[Elie De Brauwer]

Hi all,

The LSB specification of killall says "A killall process never kills 
itself (but may kill other killall processes)."

The current implementation of killall does not adhere to this rule, with 
the patch in attach killall will adhere to this rule.

Before:
edb at lapedb:~/edb-stuff/toybox/toybox$ ./toybox killall -9 toybox
Killed

After:
edb at lapedb:~/edb-stuff/toybox/toybox$ ./toybox killall -9 toybox
killall: No such process


Note: this patch should be applied after my previous submission, if for 
some reason the previous path is unwanted let me know and I'll resubmit 
this one.

my 2 cents
E.

-- 
Elie De Brauwer

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