Add misc functions for easier porting.

Android requested that the wpa_supplicant go upstream. This change adds
some dummy functions and reinstates DSA_dup_DH in order to make the diff
smaller and easier for upstream.

Change-Id: I77ac271b8652bae5a0bbe16afde51d9096f3dfb5
Reviewed-on: https://boringssl-review.googlesource.com/1740
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/pkcs8.h b/include/openssl/pkcs8.h
index 6feb7f1..26f15e7 100644
--- a/include/openssl/pkcs8.h
+++ b/include/openssl/pkcs8.h
@@ -129,6 +129,10 @@
                                             STACK_OF(X509) *out_certs,
                                             CBS *in, const char *password);
 
+/* PKCS12_PBE_add does nothing. It exists for compatibility with OpenSSL. */
+OPENSSL_EXPORT void PKCS12_PBE_add();
+
+
 #if defined(__cplusplus)
 }  /* extern C */
 #endif