enable is_direcotry() for dpkg-deb
diff --git a/utility.c b/utility.c
index fa2067a..3d5620e 100644
--- a/utility.c
+++ b/utility.c
@@ -261,7 +261,7 @@
 
 #endif /* BB_CP_MV || BB_DU */
 
-#if defined (BB_CP_MV) || defined (BB_DU) || defined (BB_LN)
+#if defined (BB_CP_MV) || defined (BB_DU) || defined (BB_LN) || defined (BB_DPKG_DEB)
 /*
  * Return TRUE if a fileName is a directory.
  * Nonexistant files return FALSE.