loading the load_der func for all backends

Author: nitneuqr

src/rust/src/pkcs7.rs

@@ -21,7 +21,6 @@ use crate::buf::CffiBuf;
 use crate::error::{CryptographyError, CryptographyResult};
 use crate::padding::PKCS7UnpaddingContext;
 use crate::pkcs12::symmetric_encrypt;
-#[cfg(not(CRYPTOGRAPHY_IS_BORINGSSL))]
 use crate::x509::certificate::load_der_x509_certificate;
 use crate::{exceptions, types, x509};