Deprecate the low level Diffie-Hellman functions.

Use of the low level DH functions has been informally discouraged for a
long time.  We now formally deprecate them.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11024)
diff --git a/fuzz/asn1.c b/fuzz/asn1.c
index 6ef6712..0858bee 100644
--- a/fuzz/asn1.c
+++ b/fuzz/asn1.c
@@ -329,8 +329,8 @@
     DO_TEST_NO_PRINT(ESS_CERT_ID_V2, d2i_ESS_CERT_ID_V2, i2d_ESS_CERT_ID_V2);
     DO_TEST_NO_PRINT(ESS_SIGNING_CERT_V2, d2i_ESS_SIGNING_CERT_V2, i2d_ESS_SIGNING_CERT_V2);
 #ifndef OPENSSL_NO_DH
-    DO_TEST(DH, d2i_DHparams, i2d_DHparams, DHparams_print);
-    DO_TEST(DH, d2i_DHxparams, i2d_DHxparams, DHparams_print);
+    DO_TEST_NO_PRINT(DH, d2i_DHparams, i2d_DHparams);
+    DO_TEST_NO_PRINT(DH, d2i_DHxparams, i2d_DHxparams);
 #endif
 #ifndef OPENSSL_NO_DSA
     DO_TEST_NO_PRINT(DSA_SIG, d2i_DSA_SIG, i2d_DSA_SIG);