Function PEM_read_PKCS7

pub unsafe extern "C" fn PEM_read_PKCS7(
    out: *mut _IO_FILE,
    x: *mut *mut pkcs7_st,
    cb: Option<unsafe extern "C" fn(_: *mut i8, _: i32, _: i32, _: *mut c_void) -> i32>,
    u: *mut c_void,
) -> *mut pkcs7_st