Function nginx::EVP_MD_meth_set_ctrl

pub unsafe extern "C" fn EVP_MD_meth_set_ctrl(
    md: *mut EVP_MD, 
    ctrl: Option<unsafe extern "C" fn(ctx: *mut EVP_MD_CTX, cmd: c_int, p1: c_int, p2: *mut c_void) -> c_int>
) -> c_int