MINOR: quic: Move quic_rxbuf_pool pool out of xprt part

This pool could be confuse with that of the RX buffer pool for the connection
(quic_conn_rxbuf).
diff --git a/include/haproxy/xprt_quic-t.h b/include/haproxy/xprt_quic-t.h
index 66912ef..ace5476 100644
--- a/include/haproxy/xprt_quic-t.h
+++ b/include/haproxy/xprt_quic-t.h
@@ -248,7 +248,6 @@
 
 extern struct trace_source trace_quic;
 extern struct pool_head *pool_head_quic_tx_ring;
-extern struct pool_head *pool_head_quic_rxbuf;
 extern struct pool_head *pool_head_quic_rx_packet;
 extern struct pool_head *pool_head_quic_tx_packet;
 extern struct pool_head *pool_head_quic_frame;
diff --git a/src/proto_quic.c b/src/proto_quic.c
index e3ea509..a0b4147 100644
--- a/src/proto_quic.c
+++ b/src/proto_quic.c
@@ -50,6 +50,11 @@
 /* per-thread quic datagram handlers */
 struct quic_dghdlr *quic_dghdlrs;
 
+/* Size of the internal buffer of QUIC RX buffer at the fd level */
+#define QUIC_RX_BUFSZ  (1UL << 18)
+
+DECLARE_STATIC_POOL(pool_head_quic_rxbuf, "quic_rxbuf_pool", QUIC_RX_BUFSZ);
+
 static void quic_add_listener(struct protocol *proto, struct listener *listener);
 static int quic_bind_listener(struct listener *listener, char *errmsg, int errlen);
 static int quic_connect_server(struct connection *conn, int flags);
diff --git a/src/xprt_quic.c b/src/xprt_quic.c
index a506667..0048f7b 100644
--- a/src/xprt_quic.c
+++ b/src/xprt_quic.c
@@ -154,7 +154,6 @@
 static BIO_METHOD *ha_quic_meth;
 
 DECLARE_POOL(pool_head_quic_tx_ring, "quic_tx_ring_pool", QUIC_TX_RING_BUFSZ);
-DECLARE_POOL(pool_head_quic_rxbuf, "quic_rxbuf_pool", QUIC_RX_BUFSZ);
 DECLARE_POOL(pool_head_quic_conn_rxbuf, "quic_conn_rxbuf", QUIC_CONN_RX_BUFSZ);
 DECLARE_STATIC_POOL(pool_head_quic_conn_ctx,
                     "quic_conn_ctx_pool", sizeof(struct ssl_sock_ctx));