Avoid redefining macros and align to 4 byte boundaries.

miner.h

@@ -800,8 +800,8 @@ struct stratum_work {
 	int diff;
 };
 
-#define RECVSIZE 8191
-#define RBUFSIZE (RECVSIZE + 1)
+#define RECVSIZE 8192
+#define RBUFSIZE (RECVSIZE + 4)
 
 struct pool {
 	int pool_no;

util.c

@@ -914,9 +914,6 @@ bool stratum_send(struct pool *pool, char *s, ssize_t len)
 	return ret;
 }
 
-#define RECVSIZE 8191
-#define RBUFSIZE (RECVSIZE + 1)
-
 static void clear_sock(struct pool *pool)
 {
 	SOCKETTYPE sock = pool->sock;