db: simplify struct apk_name a little bit

src/apk_database.h

@@ -105,14 +105,12 @@ struct apk_name {
 	unsigned is_dependency : 1;
 	unsigned auto_select_virtual: 1;
 	unsigned priority : 2;
-	unsigned layer : 4;
 	unsigned solver_flags_set : 1;
 	unsigned providers_sorted : 1;
 	unsigned int foreach_genid;
 	union {
 		struct apk_solver_name_state ss;
-		unsigned char state_buf[sizeof(struct apk_solver_name_state)];
-		void *state_ptr;
+		unsigned long state_buf[4];
 		int state_int;
 	};
 };