reduce some wasted space in dso structure

src/ldso/dynlink.c

@@ -47,9 +47,9 @@ struct dso
 	size_t map_len;
 	dev_t dev;
 	ino_t ino;
-	int global;
-	int relocated;
-	int constructed;
+	char global;
+	char relocated;
+	char constructed;
 	struct dso **deps;
 	char *name;
 	char buf[];