index: fix warning about package names without provider

It's real only if there's a package with actual dependency
(conflicts and install_if dependencies do not count).

src/apk_database.h

@@ -92,8 +92,8 @@ struct apk_name {
 	struct apk_provider_array *providers;
 	struct apk_name_array *rdepends;
 	struct apk_name_array *rinstall_if;
+	unsigned is_dependency : 1;
 	unsigned int foreach_genid;
-
 	union {
 		struct apk_solver_name_state ss;
 		void *state_ptr;

src/database.c

@@ -498,6 +498,7 @@ static void apk_db_pkg_rdepends(struct apk_database *db, struct apk_package *pkg
 
 	foreach_array_item(d, pkg->depends) {
 		rname = d->name;
+		rname->is_dependency |= !d->conflict;
 		foreach_array_item(rd, rname->rdepends)
 			if (*rd == pkg->name)
 				goto rdeps_done;

src/index.c

@@ -74,14 +74,15 @@ static int warn_if_no_providers(apk_hash_item item, void *ctx)
 	struct counts *counts = (struct counts *) ctx;
 	struct apk_name *name = (struct apk_name *) item;
 
-	if (name->providers->num == 0) {
-		if (++counts->unsatisfied < 10) {
-			apk_warning("No provider for dependency '%s'",
-				    name->name);
-		} else if (counts->unsatisfied == 10) {
-			apk_warning("Too many unsatisfiable dependencies, "
-				    "not reporting the rest.");
-		}
+	if (!name->is_dependency) return 0;
+	if (name->providers->num) return 0;
+
+	if (++counts->unsatisfied < 10) {
+		apk_warning("No provider for dependency '%s'",
+			    name->name);
+	} else if (counts->unsatisfied == 10) {
+		apk_warning("Too many unsatisfiable dependencies, "
+			    "not reporting the rest.");
 	}
 
 	return 0;