Warn about excessive func args

[quasilyte]

Code Example

stat($filename, $flags);

Actual Behavior

No warnings.

Expected Behavior

Warning about the extra (excessive) argument passed to stat (or any other) function.

Seems reasonable for functions that don't use func_get_args and are not variadic.

[YuriyNasretdinov]

Yeah, but you have to make sure that all the internal (and extension) functions are annotated as having variadic arguments. I think they do but it is worth checking that printf for example is defined as having variadic arguments.