Avoid duplicate dependencies in remote repos

When a remote repo reports multiple time the same package which could
happen in case the same package do exist with multiple extension or hash

Deduplicate the dependency loading chaing to avoir useless warning

libpkg/pkgdb_iterator.c

@@ -221,7 +221,7 @@ pkgdb_load_deps(sqlite3 *sqlite, struct pkg *pkg)
 	bool options_match;
 	char *formula_sql, *clause;
 	const char	 sql[] = ""
-		"SELECT d.name, d.origin, p.version, 0"
+		"SELECT DISTINCT d.name, d.origin, p.version, 0"
 		"  FROM deps AS d"
 		"    LEFT JOIN packages AS p ON"
 		"    (p.origin = d.origin AND p.name = d.name)"