Binding for const <typedef-ed array type> has incorrect mutability

Input C/C++ Header

typedef int int1[1];
void f(const int1 x);

Bindgen Invocation

$ bindgen test.h

Actual Results

/* automatically generated by rust-bindgen 0.56.0 */

pub type int1 = [::std::os::raw::c_int; 1usize];
extern "C" {
    pub fn f(x: *mut ::std::os::raw::c_int);
}

Expected Results

The type of the parameter x should be *const ::std::os::raw::c_int:

/* automatically generated by rust-bindgen 0.56.0 */

pub type int1 = [::std::os::raw::c_int; 1usize];
extern "C" {
    pub fn f(x: *const ::std::os::raw::c_int);
}

Start by reproducing the issue with the provided test.h header and the bindgen test.h invocation. Trace how const is handled for a const typedef-ed array parameter, then verify that the generated declaration uses *const rather than *mut and add a regression check for the shown input.