Remove dependency of dsa_sign.o and dsa_vrf.o: new functions FIPS_dsa_sig_new
and FIPS_dsa_sig_free, reimplment DSA_SIG_new and DSA_SIG_free from ASN1
library.

fips/dsa/fips_dsa_lib.c

diff --git a/fips/dsa/fips_dsa_lib.c b/fips/dsa/fips_dsa_lib.c
index 06f8cab..2e2f192 100644
--- a/fips/dsa/fips_dsa_lib.c
+++ b/fips/dsa/fips_dsa_lib.c
@@ -96,3 +96,26 @@
 	OPENSSL_free(r);
 	}
 
+DSA_SIG *FIPS_dsa_sig_new(void)
+	{
+	DSA_SIG *sig;
+	sig = OPENSSL_malloc(sizeof(DSA_SIG));
+	if (!sig)
+		return NULL;
+	sig->r = NULL;
+	sig->s = NULL;
+	return sig;
+	}
+
+void FIPS_dsa_sig_free(DSA_SIG *sig)
+	{
+	if (sig)
+		{
+		if (sig->r)
+			BN_free(sig->r);
+		if (sig->s)
+			BN_free(sig->s);
+		OPENSSL_free(sig);
+		}
+	}
+