[Omake] error when defining a rule inside of a function

[Erick Tryzelaar]

Aleksey Nogin wrote:
> Hm, this works correctly for me. Which version of OMake are you using?
> Have you may be redefined the "rule" function?
>   

I think thats what I was doing. I didn't know that defining a function 
named "rule" would break rule defining :)