lib/dnssec: fix build against libdnssec 3.0

It hasn't been released yet, but this patch fixes build against
current Knot master already.

NEWS

@@ -7,6 +7,7 @@ Improvements
 - cache: add percentage usage to cache.stats() (!1025)
 - cache: add number of cache entries to cache.stats() (!1028)
 - aarch64 support again, as some systems still didn't work (!1033)
+- support building against Knot DNS 3.0 (!1053)
 
 Bugfixes
 --------

lib/dnssec/signature.c

@@ -282,7 +282,12 @@ int kr_check_signature(const knot_rdata_t *rrsig,
 		goto fail;
 	}
 
-	if (dnssec_sign_verify(sign_ctx, &signature) != 0) {
+	ret = dnssec_sign_verify(sign_ctx,
+		#if KNOT_VERSION_MAJOR >= 3
+			false,
+		#endif
+			&signature);
+	if (ret != 0) {
 		ret = kr_error(EBADMSG);
 		goto fail;
 	}