Function openssl_sys::EVP_PKEY_CTX_ctrl

pub unsafe extern fn EVP_PKEY_CTX_ctrl(ctx: *mut EVP_PKEY_CTX,
                                       keytype: c_int,
                                       optype: c_int,
                                       cmd: c_int,
                                       p1: c_int,
                                       p2: *mut c_void)
                                       -> c_int