[PATCH] Make the analyzer detect more misues of open(2)

[Daniel Fahlgren]

Hi,

These patches makes the unix.API checker detect more errors when using
open(2). The first is to detect when open is called with more than three
arguments. The second patch makes sure that the third argument is an
integer.

I've added a new test file for these cases. The current one, nix-fns.c,
does a lot more than simply testing the expected warnings.

Cheers,
Daniel Fahlgren
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