internal/asn1.h: Add missing '#include <openssl/bio.h>'

Reviewed-by: NPaul Dale <pauli@openssl.org>
Reviewed-by: NTomas Mraz <tomas@openssl.org>
Reviewed-by: NDavid von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/15913)

include/internal/asn1.h

@@ -11,6 +11,8 @@
 # define OSSL_INTERNAL_ASN1_H
 # pragma once
 
+# include <openssl/bio.h>
+
 int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
 
 #endif