bindings: Remove remaining Rf_isS4 and R_altrep_Coerce_method_t as we manually define those

[CGMossa]

Somehow, these bindings was not removed from the cached bindings. I suspect our way of detecting devel might have been wonky, or a git merge went awry.

Either case, here's a potential hotfix.

[JosiahParry]

Note that these are defined in the lib.rs

libR-sys/src/lib.rs

Lines 80 to 91 in 37fdd30

	pub type R_altrep_Coerce_method_t =
	::std::option::Option<unsafe extern "C" fn(arg1: SEXP, arg2: SEXPTYPE) -> SEXP>;
	pub unsafe fn Rf_isS4(arg1: SEXP) -> Rboolean {
	unsafe {
	if secret::Rf_isS4_original(arg1) == 0 {
	Rboolean::FALSE
	} else {
	Rboolean::TRUE
	}
	}
	}

@CGMossa do we need to change anything related to the build process to ensure that these functions are removed in the future?

[CGMossa]

I don't think so. Their removal was working on the other generated bindings files.