Include wc_GetPkcs8TraditionalOffset also when RSA feature is selected

It's part of the ASN feature but since it's also used by the RSA
binding this function must also be part of the library when only
the RSA feature is selected.

Author: mjdemilliano

scripts/build_ffi.py

@@ -741,8 +741,6 @@ def build_ffi(local_wolfssl, features):
         int wc_InitRsaKey(RsaKey* key, void*);
         int wc_FreeRsaKey(RsaKey* key);
 
-        int wc_GetPkcs8TraditionalOffset(byte* input, word32* inOutIdx, word32 sz);
-
         int wc_RsaPrivateKeyDecode(const byte*, word32*, RsaKey*, word32);
         int wc_RsaPublicKeyDecode(const byte*, word32*, RsaKey*, word32);
         int wc_RsaEncryptSize(RsaKey*);
@@ -961,6 +959,12 @@ def build_ffi(local_wolfssl, features):
                                   int hashOID);
         """
 
+    if features["ASN"] or features["RSA"]:
+        # This ASN function is used by the RSA binding as well.
+        cdef += """
+        int wc_GetPkcs8TraditionalOffset(byte* input, word32* inOutIdx, word32 sz);
+        """
+
     if features["KEYGEN"]:
         cdef += """
         int wc_PemToDer(const unsigned char* buff, long longSz, int type,